[bullen]

Not for small amounts of data.

Bandwith increases, but if you only need a few bytes DDR3 is faster.

Also slower speed means less heat and longer life.

You can feel the speed advantage by just moving the mouse on a DDR3 PC...

[kbolino]

While it has nothing to do with how responsive your mouse feels, as that is measured in milliseconds while CAS latency is measured in nanoseconds, there has indeed been a small regression with DDR5 memory compared to the 3 previous generations. The best DDR2-4 configurations could fetch 1 word in about 6-7 ns while the best DDR5 configurations take about 9-10 ns.

https://en.wikipedia.org/wiki/CAS_latency#Memory_timing_exam...

[mrob]

RAM latency doesn't affect mouse response in any perceptible way. The fastest gaming mice I know of run at 8000Hz, so that's 125000ns between samples, much bigger than any CAS latency. And most mice run substantially slower.

Maybe your old PC used lower-latency GUI software, e.g. uncomposited Xorg instead of Wayland.

[bullen]

I only felt it on Windows, maybe tht is due to the special USB mouse drivers Microsoft made? Still motion-to-photon latency is really lower on my DDR3 PCs, would be cool to know why.