Very first thing I'd try is to check the drive(s) for errors... it may be that weak sectors are making reading and writing slow... I've seen hard drives that took as long as 5 seconds per sector... the data was still read, it just took a long time. Those sectors failed completely shortly afterward.
I used to have a LiveCD that would worry over every single sector on a drive, repeatedly writing certain patterns of data to each sector to attempt to rejuvenate the sector, then marking the sector as bad if it failed... it'd take days and days and days to run, but it worked. Not sure why, but it actually increased the read speed for healthy sectors.
Now, I do this:
Next thing I'd check is that your memory is properly seated, and its clock speed matches what the motherboard is clocking it at. I'd also ensure the memory was matched sticks (both the same amount of memory, and both the same clock speed) so memory interleaving could take place to speed up data transfer. Then I'd test the memory to be sure it's not faulty.
Next thing I'd check is the CPU, GPU and power supply cooling... it may be that one of them is throttling back or malfunctioning because it's getting too hot... check that your fans spin easily by finger without any bearing noise (put your ear right next to the fan as you spin it with your finger... a noisy bearing will sound like "crunkle, crunkle, crunkle" and the fan may shift back and forth on its axis when you push sideways on it.). Check that the fans spin up when the machine is on, and if you've got variable-speed fans, that they ramp up as load increases.
Clean all the heatsinks on the CPU and GPU and power supply... I've found the best way of doing this is with a vacuum cleaner with a brush attachment to suck the dust out, and a pipe cleaner to scrub between the fins. So you'd scrub the dust out of the heat sink with the pipe cleaner, then suck it away with the vacuum. Clean the fan blades, too.
Then, and only then, would I consider addressing potential driver issues.
As to whether you've got multiple GPUs:
xapp-gpu-offload -l
... that'll list your GPUs.
Now let's say you have two GPUs...
0 default [ Integrated GPU ]
1 [ Nvidia GeForce RTX 2060 ]
You can switch from the integrated to the Nvidia GPU via:
xapp-gpu-offload -i 1