perf: multiple small improvements

[KermanX]

Try to improve performance via multiple small improvements.

I have no idea why some of the smoke tests fail 🫠

[netlify]

✅ Deploy Preview for slidev ready!

Name	Link
🔨 Latest commit	3974ab6
🔍 Latest deploy log	https://app.netlify.com/sites/slidev/deploys/66ddc0abdc412d00087f0d36
😎 Deploy Preview	https://deploy-preview-1812--slidev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[pkg-pr-new]

Open in Stackblitz

create-slidev

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev@1812

create-slidev-theme

pnpm add https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@1812

@slidev/client

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/client@1812

@slidev/cli

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/cli@1812

@slidev/parser

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/parser@1812

@slidev/types

pnpm add https://pkg.pr.new/slidevjs/slidev/@slidev/types@1812

commit: 3974ab6