Unexpected latency issue

No worries. Thank you. I am using Mesa hardware. At this point I guess I'm just going to look for a good used Optiplex. At least that way I'll have a little piece of mind when running the machine. Thank you all so much for your help. This forum is awesome.

Update: I bought a used desktop PC (as suggested) along with a monitor, keyboard, etc. The PC is a Lenovo M93P Tiny desktop model with an i5 2.9ghz CPU, 8GB RAM, and a 256GB HDD. Surely I thought this would suffice. I always read about an older desktop being good enough to use for CNC and run the RT kernal. I went through the install process of LinuxCNC. HORRIBLE latency test results. Can you guys help me out? Now I'm just throwing money away. I have 2 GLX Gears open with a few internet windows and I can barely type this response. I have already gone into the BIOS and disabled any power saving or unnecessary features. This is the slowest system I have seen in awhile. Please help.

Yes sir. The first thing I did was go through the BIOS and disable a bunch of stuff. Hyperthreading is disabled and C states is set at C1 (as low as I could go). Looks like a 4570T so you were pretty close. I notice it only says 2 cores though:/ I thought it should've read 4. I did not yet disable the multiprocessor support. I thought that would make it even worse. How does disabling the processing power/support help the PC rather than make it even slower? I'll give that a shot right now. Is it better to allocate more or less RAM to the video card? I have that option as well, from 32MB to 1024MB.
Links to BIOS pictures:
drive.google.com/file/d/16Cgu23AwxzYIaPk.../view?usp=share_link
drive.google.com/file/d/16ELIdnWIuNs64Ai.../view?usp=share_link
drive.google.com/file/d/16LDx8lLA63Y47WJ.../view?usp=share_link
drive.google.com/file/d/16G8nqjDNJ0y_P5N.../view?usp=share_link
drive.google.com/file/d/16OtHkAC-gvWqYPe.../view?usp=share_link
drive.google.com/file/d/16XbhWJwSZWiVy5x.../view?usp=share_link

I've disabled about every option in the BIOS and reduced the video card allocated RAM. I ran the histogram for a bit with some stuff open and then I ran the latency test as well. I'm still showing 7 figures on the latency test with just a few internet windows open and 1 terminal. This is ridiculous.

The only thing I can think of is failing hardware generating spurious interrupts that consume processor time.
I would reseat all memory chips and and cards in the machine. but thats an outside chance.

I als notice a big disconnect between the 2 latency test methods. the histogram is much better.

Could you try
latency-histogram --nobase --sbins 1000

and share the screen dump?