If you've been around there is a race between games that tax the hardware and hardware that improves and provides more CPU/GPU power.
If you reach some plateau then you have to improve or replace the PC or parts.
It's a shame you only posted what you did and not the reason you did all this latency testing. In itself it's just a test and doesn't mean there is a real problem to solve. Also, not a word about your Pentium 4 machine?
I did several tests with occt and latencymon
when I do 100% load to cpu or 100% load to gpu it's working fine
when using 100% load on both the same time I got frame rate drop in spikes and hiccups on the 3d rendering
I did a latency test with latencymon.
it was actually ok
I even got less latency under heavy load then with normal use of pc
Switching between programs gives a short high latency spike though
in short how can I make the hiccups and framerate drops dissepear?