The pseudoterminal extension API latency seems much higher than it was before

[Tyriar]

Not sure if something happened on the terminal or extension API but latency can easily hit 500ms+ on a keystroke which leads to a pretty bad experience.

[Tyriar]

@deepak1556 has something happened around message ports/ipc? This is super fast in v1.68 but very laggy in Insiders. The API allows extensions to create and control terminals, so it goes to the extension host instead of shared process->pty host.

To repro run this extension sample https://github.com/microsoft/vscode-extension-samples/tree/main/extension-terminal-sample and run the Extension Terminal Sample: Create command.

[deepak1556]

Can confirm the issue only happens with "extensions.experimental.useUtilityProcess": true

/cc @alexdima

[deepak1556]

There was an issue in the timers interaction with event loop. Issue will be fixed in runtime tomorrow.