[fix](trx-frontend-http): skip redundant DOM writes in render() hot path
The render() function runs on every SSE event (5-20×/sec) and was unconditionally writing to decoder toggle buttons and About-tab decoder status elements — 8 getElementById calls + 32 DOM property writes per frame — even when values hadn't changed. This caused unnecessary style recalculation overhead on every SSE frame, contributing to spectrum stuttering. Changes: - Cache all 7 decoder toggle button elements at module init instead of calling getElementById on every render() call - Track last-written enabled state per button; skip DOM writes when the value is unchanged (steady-state cost: 0 DOM writes per frame) - Same pattern for 8 About-tab decoder status elements - Gate updateSatLiveState className/textContent writes on value change Net effect: eliminates ~50 unnecessary DOM operations per SSE frame during normal operation (decoders rarely toggle). https://claude.ai/code/session_01G6wuNCkckbHHsU7w5zCtW2 Signed-off-by: Claude <noreply@anthropic.com>
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Claude
@@ -363,6 +363,41 @@ const headerStylePickSelect = document.getElementById("header-style-pick-select"
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const rdsPsOverlay = document.getElementById("rds-ps-overlay");
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let overviewPeakHoldMs = Number(loadSetting("overviewPeakHoldMs", 2000));
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let decodeHistoryRetentionMin = 24 * 60;
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// Cached decoder toggle buttons — avoids 8× getElementById per render() call.
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const _decoderToggles = {
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ft8: { el: document.getElementById("ft8-decode-toggle-btn"), last: null },
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ft4: { el: document.getElementById("ft4-decode-toggle-btn"), last: null },
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ft2: { el: document.getElementById("ft2-decode-toggle-btn"), last: null },
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wspr: { el: document.getElementById("wspr-decode-toggle-btn"), last: null },
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hfAprs: { el: document.getElementById("hf-aprs-decode-toggle-btn"), last: null },
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sat: { el: document.getElementById("sat-decode-toggle-btn"), last: null },
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lrpt: { el: document.getElementById("lrpt-decode-toggle-btn"), last: null },
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};
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function syncDecoderToggle(entry, enabled, label) {
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if (!entry.el || entry.last === enabled) return;
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entry.last = enabled;
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entry.el.dataset.enabled = enabled ? "true" : "false";
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entry.el.textContent = enabled ? `Disable ${label}` : `Enable ${label}`;
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entry.el.style.borderColor = enabled ? "#00d17f" : "";
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entry.el.style.color = enabled ? "#00d17f" : "";
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}
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// Cached About-tab decoder status elements — avoids 8× getElementById per render().
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const _aboutDecEls = [
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"about-dec-ft8", "about-dec-ft4", "about-dec-ft2", "about-dec-wspr",
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"about-dec-cw", "about-dec-aprs", "about-dec-sat", "about-dec-lrpt",
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].map((id) => ({ el: document.getElementById(id), last: null }));
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function syncAboutDecoder(idx, enabled) {
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const entry = _aboutDecEls[idx];
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if (!entry || !entry.el || entry.last === enabled) return;
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entry.last = enabled;
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entry.el.textContent = enabled ? "Active" : "Off";
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entry.el.className = enabled ? "about-status-on" : "about-status-off";
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}
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let primaryRds = null;
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let vchanRdsById = new Map();
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let vchanSignalDbById = new Map();
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@@ -3229,62 +3264,14 @@ function render(update) {
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pttBtn.style.color = "";
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}
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}
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const ft8ToggleBtn = document.getElementById("ft8-decode-toggle-btn");
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if (ft8ToggleBtn) {
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const ft8On = !!update.ft8_decode_enabled;
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ft8ToggleBtn.dataset.enabled = ft8On ? "true" : "false";
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ft8ToggleBtn.textContent = ft8On ? "Disable FT8" : "Enable FT8";
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ft8ToggleBtn.style.borderColor = ft8On ? "#00d17f" : "";
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ft8ToggleBtn.style.color = ft8On ? "#00d17f" : "";
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}
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const ft4ToggleBtn = document.getElementById("ft4-decode-toggle-btn");
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if (ft4ToggleBtn) {
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const ft4On = !!update.ft4_decode_enabled;
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ft4ToggleBtn.dataset.enabled = ft4On ? "true" : "false";
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ft4ToggleBtn.textContent = ft4On ? "Disable FT4" : "Enable FT4";
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ft4ToggleBtn.style.borderColor = ft4On ? "#00d17f" : "";
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ft4ToggleBtn.style.color = ft4On ? "#00d17f" : "";
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}
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const ft2ToggleBtn = document.getElementById("ft2-decode-toggle-btn");
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if (ft2ToggleBtn) {
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const ft2On = !!update.ft2_decode_enabled;
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ft2ToggleBtn.dataset.enabled = ft2On ? "true" : "false";
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ft2ToggleBtn.textContent = ft2On ? "Disable FT2" : "Enable FT2";
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ft2ToggleBtn.style.borderColor = ft2On ? "#00d17f" : "";
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ft2ToggleBtn.style.color = ft2On ? "#00d17f" : "";
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}
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const wsprToggleBtn = document.getElementById("wspr-decode-toggle-btn");
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if (wsprToggleBtn) {
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const wsprOn = !!update.wspr_decode_enabled;
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wsprToggleBtn.dataset.enabled = wsprOn ? "true" : "false";
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wsprToggleBtn.textContent = wsprOn ? "Disable WSPR" : "Enable WSPR";
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wsprToggleBtn.style.borderColor = wsprOn ? "#00d17f" : "";
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wsprToggleBtn.style.color = wsprOn ? "#00d17f" : "";
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}
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const hfAprsToggleBtn = document.getElementById("hf-aprs-decode-toggle-btn");
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if (hfAprsToggleBtn) {
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const hfAprsOn = !!update.hf_aprs_decode_enabled;
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hfAprsToggleBtn.dataset.enabled = hfAprsOn ? "true" : "false";
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hfAprsToggleBtn.textContent = hfAprsOn ? "Disable HF APRS" : "Enable HF APRS";
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hfAprsToggleBtn.style.borderColor = hfAprsOn ? "#00d17f" : "";
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hfAprsToggleBtn.style.color = hfAprsOn ? "#00d17f" : "";
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}
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const satToggleBtn = document.getElementById("sat-decode-toggle-btn");
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if (satToggleBtn) {
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const satOn = !!update.wxsat_decode_enabled;
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satToggleBtn.dataset.enabled = satOn ? "true" : "false";
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satToggleBtn.textContent = satOn ? "Disable NOAA APT" : "Enable NOAA APT";
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satToggleBtn.style.borderColor = satOn ? "#00d17f" : "";
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satToggleBtn.style.color = satOn ? "#00d17f" : "";
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}
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const lrptToggleBtn = document.getElementById("lrpt-decode-toggle-btn");
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if (lrptToggleBtn) {
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const lrptOn = !!update.lrpt_decode_enabled;
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lrptToggleBtn.dataset.enabled = lrptOn ? "true" : "false";
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lrptToggleBtn.textContent = lrptOn ? "Disable Meteor LRPT" : "Enable Meteor LRPT";
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lrptToggleBtn.style.borderColor = lrptOn ? "#00d17f" : "";
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lrptToggleBtn.style.color = lrptOn ? "#00d17f" : "";
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}
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// Decoder toggle buttons: only write DOM when the enabled flag actually changes.
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syncDecoderToggle(_decoderToggles.ft8, !!update.ft8_decode_enabled, "FT8");
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syncDecoderToggle(_decoderToggles.ft4, !!update.ft4_decode_enabled, "FT4");
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syncDecoderToggle(_decoderToggles.ft2, !!update.ft2_decode_enabled, "FT2");
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syncDecoderToggle(_decoderToggles.wspr, !!update.wspr_decode_enabled, "WSPR");
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syncDecoderToggle(_decoderToggles.hfAprs, !!update.hf_aprs_decode_enabled, "HF APRS");
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syncDecoderToggle(_decoderToggles.sat, !!update.wxsat_decode_enabled, "NOAA APT");
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syncDecoderToggle(_decoderToggles.lrpt, !!update.lrpt_decode_enabled, "Meteor LRPT");
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if (window.updateSatLiveState) window.updateSatLiveState(update);
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const cwAutoEl = document.getElementById("cw-auto");
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const cwWpmEl = document.getElementById("cw-wpm");
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@@ -3453,24 +3440,15 @@ function render(update) {
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document.getElementById("about-audio-streams").textContent = update.audio_clients;
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}
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// About — Decoders card
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const decMap = [
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["about-dec-ft8", update.ft8_decode_enabled],
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["about-dec-ft4", update.ft4_decode_enabled],
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["about-dec-ft2", update.ft2_decode_enabled],
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["about-dec-wspr", update.wspr_decode_enabled],
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["about-dec-cw", update.cw_decode_enabled],
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["about-dec-aprs", update.aprs_decode_enabled || update.hf_aprs_decode_enabled],
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["about-dec-sat", update.wxsat_decode_enabled],
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["about-dec-lrpt", update.lrpt_decode_enabled],
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];
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for (const [id, enabled] of decMap) {
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const el = document.getElementById(id);
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if (el) {
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el.textContent = enabled ? "Active" : "Off";
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el.className = enabled ? "about-status-on" : "about-status-off";
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}
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}
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// About — Decoders card (only update when values change)
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syncAboutDecoder(0, !!update.ft8_decode_enabled);
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syncAboutDecoder(1, !!update.ft4_decode_enabled);
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syncAboutDecoder(2, !!update.ft2_decode_enabled);
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syncAboutDecoder(3, !!update.wspr_decode_enabled);
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syncAboutDecoder(4, !!update.cw_decode_enabled);
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syncAboutDecoder(5, !!(update.aprs_decode_enabled || update.hf_aprs_decode_enabled));
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syncAboutDecoder(6, !!update.wxsat_decode_enabled);
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syncAboutDecoder(7, !!update.lrpt_decode_enabled);
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// About — Integrations card
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if (update.pskreporter_status) {
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@@ -73,15 +73,21 @@ satViewPredictionsBtn?.addEventListener("click", () => switchSatView("prediction
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// ── Live view: decoder state ────────────────────────────────────────
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// Updated from app.js render() via window.updateSatLiveState
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let _lastSatAptOn = null, _lastSatLrptOn = null;
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window.updateSatLiveState = function (update) {
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if (!satAptState || !satLrptState) return;
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const aptOn = !!update.wxsat_decode_enabled;
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const lrptOn = !!update.lrpt_decode_enabled;
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satAptState.textContent = aptOn ? "Listening" : "Idle";
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satAptState.className = "sat-live-value " + (aptOn ? "sat-state-listening" : "sat-state-idle");
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satLrptState.textContent = lrptOn ? "Listening" : "Idle";
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satLrptState.className = "sat-live-value " + (lrptOn ? "sat-state-listening" : "sat-state-idle");
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if (aptOn !== _lastSatAptOn) {
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_lastSatAptOn = aptOn;
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satAptState.textContent = aptOn ? "Listening" : "Idle";
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satAptState.className = "sat-live-value " + (aptOn ? "sat-state-listening" : "sat-state-idle");
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}
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if (lrptOn !== _lastSatLrptOn) {
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_lastSatLrptOn = lrptOn;
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satLrptState.textContent = lrptOn ? "Listening" : "Idle";
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satLrptState.className = "sat-live-value " + (lrptOn ? "sat-state-listening" : "sat-state-idle");
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}
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};
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function renderSatLatestCard() {
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