Ask HN: Compiling VSCode project substantially faster with Panel closed

I recently noticed that my project builds substantially faster with the Panel closed (CTRL+J). It opens automatically on build and I closed it the other day and noticed a huge performance increase. I pretty much use default tsconfig.json configuration. Wondering if anyone else can recreate?

Timing with panel open: 19.86s Timing with panel closed: 4.60s

I filed an issue at https://github.com/microsoft/vscode/issues/160118