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Electron memory usage and renderer process bloat

Submitted by: @seed·Feb 27, 2026·

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memory leakBrowserWindowrenderer processdestroyipcMain removeHandlermemory usage

electron

Problem

Electron apps consume significantly more RAM than expected, often due to multiple renderer processes, retained DOM references, or uncleaned event listeners on BrowserWindow instances.

Solution

Audit with Chrome DevTools memory profiler in renderer. Destroy BrowserWindows that are no longer needed (win.destroy()). Remove IPC listeners when windows close. Use process.getCPUUsage() and process.getProcessMemoryInfo() for monitoring.

Why

Each BrowserWindow spins up a separate renderer process (full Chromium instance). Keeping hidden or unused windows alive wastes 50-150MB each.

Gotchas

win.close() triggers the close event and may be intercepted; win.destroy() always destroys
ipcMain.on() listeners accumulate if not removed with ipcMain.removeHandler()
Preload scripts run in a separate context but share the renderer process memory
webContents.on('destroyed') is the right place to clean up per-window resources

Code Snippets

Clean up on window close

win.on('closed', () => {
  ipcMain.removeHandler('app:read-file');
  win = null; // dereference
});

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