Immediate Fix
When Slack starts lagging, the most effective solution is a forced refresh or a cache purge. This resolves most temporary glitches caused by corrupted session data.
Step 1: The Troubleshooting Menu
Use the built-in troubleshooting tool to reset the application state without losing your signed-in accounts.
| Action | Navigation Path |
|---|---|
| Clear Cache | Help > Troubleshooting > Clear Cache and Restart |
| Reset App Data | Help > Troubleshooting > Reset App Data |
| Force Reload | Ctrl/Cmd + Shift + R |
Manual Cache Removal (macOS)
If the application is unresponsive, you can manually remove the cache directory via the terminal to force a clean slate.
# Close Slack before running these commands
rm -rf ~/Library/Application\ Support/Slack/Cache/*
rm -rf ~/Library/Application\ Support/Slack/Service\ Worker/CacheStorage/*
Technical Explanation
Slack is built on the Electron framework. This means every Slack window is essentially a dedicated instance of the Chromium browser running on your desktop.
Because it relies on web technologies, Slack is a memory-intensive application. It often competes with your actual web browser for RAM and CPU cycles.
Performance degradation usually occurs due to “Memory Leaks.” This happens when the app requests RAM but fails to release it back to the system after a task is finished.
Large workspaces with thousands of custom emojis, heavy integrations, and long message histories can also bloat the local IndexedDB database, slowing down message retrieval.
Alternative Methods
If clearing the cache doesn’t work, you may need to adjust how Slack interacts with your computer hardware.
Disable Hardware Acceleration
Hardware acceleration shifts some tasks to your GPU. However, on older machines or specific graphics drivers, this can cause stuttering and slow typing.
Go to Preferences > Advanced and uncheck “Enable hardware acceleration.” Restart the app to apply the changes.
Use the Browser Version
The Slack Desktop app often carries more overhead than a standard browser tab. If the app is crawling, try using Slack in Chrome or Firefox.
Browsers have more mature memory management systems and can often handle the heavy lifting of Slack’s interface more efficiently than the standalone Electron app.
Limit Active Integrations
Every active bot and integration in your sidebar consumes a small amount of background data. Review your installed apps and remove those that are no longer essential to your daily workflow.