My pc is a 2008's laptop very old with.:
- 1Intel CPU575@2GHz
- 4Gb RAM
I have Strecth and KDE, and my system is very well balanced (It all feels very smooth and good):
- Kernel 4.4
- microcode, and firmware holded to a vey specific versions
..I would like to move on to Buster, but I worry Buster and KDE5 eats more CPU and RAM..furthermore I would have to install kernel 4.4 if possible, and downgrade video firmware and perhaps remove or downgrade also microcode...last security patches downgrade my cpu and its a gap very thin before it comes into obsolecence performance (needs to stay very precise calibrated).
I dont know what to do if its worths to upgrade, or should hold on at stretch and buy a new computer eventually.



thanks.