Try CachyOS for a fast Linux-based Live CD ISO (includes RAM/CPU test programs)

For a fast and responsive Live CD or installation try Arch Linux-based CachyOS. I tried the Desktop version of the Install/LiveCD ISO.

The ISO's grub2 menu also has a MemTest86+ v7.2 option...

Once booted to the Live CD, you can install various versions onto your internal hard disk or just run the Live CD Desktop OS. OCCT is included...

Istopo - Show Hardware example (VBOX)

OCCT CPU+RAM and Benchmark Test

OCTT App. - benchmark config

More start menu apps.

Gparted, FireFox and various editors are also included.