steam toast notifications issue cause very long lag spikes/30fps lock

[davemd55]

Steam Machine 512GB

• Steam client version: latest
• SteamOS version: SteamOS 3.8
• Opted into Steam client beta?: no
• Opted into SteamOS beta?: no
• Have you checked for updates in Settings > System?: yes

Steam toast notifications such as friends starting game causes a massive 5-10 second frame lagspike/freeze then the game locks at 30fps after this event. Performance setting is set at high and 60fps framelock. Requires restart or sometimes goes back to 60fps after a few minutes.

Steps for reproducing this issue:

1. Launch a game on your device
2. Have a friend launch a game on their device to trigger steam toast notifications on your game
3. Popup causes extreme lag and 30fps frame lock