webview open slow on 1.101

[wszgrcy]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.101
• OS Version: windows 10

Steps to Reproduce:

same as #245756

When I used the test version, the performance was normal, but when testing the official version(1.101.0), the performance became slower again.

test version ccdd214

After testing, it was found that the speed of webview slows down when it is first opened, but it returns to normal thereafter
Better than before (1.99)

[deepak1556]

Please run the following command to narrow down the commit range that re-introduced the regression

• npx --yes vscode-bisect@latest
• follow the instructions until you found the offending build
• report back the commit range in this issue

Thanks!