The only time I had this other than changing to SSD was when I got my first multi-core system, a Q6600 (confusingly labeled a Core 2 Quad). Had a great time with that machine.

"Core" was/is like "PowerPC" or "Ryzen", just a name. Intel Core i9, for instance, as opposed to Intel Pentium D, both x86_x64, different chip features.