Standard icon packs rarely slow down modern phones since icons are just static images. Download - Minimal UI - Icon Pack APK for Android
If you're looking for this specific aesthetic, several highly-rated packs feature minimalist yellow designs: Download Yellow Minimal Icons Mod apk
Be cautious with "Mod APKs" from unofficial sites. It is always safer to download from trusted sources like the Google Play Store or F-Droid to avoid security risks. Standard icon packs rarely slow down modern phones