Fix for Microsoft Edge Lag: Disable the QUIC Protocol
Recently, I noticed Microsoft Edge had become extremely laggy, with CPU usage spiking on certain websites. The browser would grind to a halt on dynamic sites like aistudio.google.com and UI component showcases like magicui.design and ui.aceternity.com.
I tried all the usual fixes: clearing the cache, using a private tab with no extensions, and even creating a new user profile. Nothing worked. I switched to Microsoft Edge Beta, hoping the development build would solve it, but the same issue reappeared after just two days.
The Fix: Disable QUIC
The solution that finally worked was disabling the Experimental QUIC protocol. QUIC (Quick UDP Internet Connections) is a protocol designed to speed up web connections, but in this case, it seems to be the source of the performance issues.
How to Disable QUIC in Edge:
- Open the Microsoft Edge browser.
- In the address bar, type
edge://flags/and press Enter. - Search for
Experimental QUIC protocol. - Set it to Disabled from the drop-down menu.
- Restart the browser when prompted.
After this change, the browser’s performance returned to normal.
Credit for this solution goes to this Reddit comment.