Premiere Pro is exporting EXTREMELY slow on decent hardware, and underutilizing my CPU and GPU

Hello,

I don't really know where else to go because I've just spent the last three hours looking for a fix and nothing I found helped.  I recently built a new PC (12600k, RTX 3060, 32GB of DDR5 RAM.) I have Premiere Pro installed on a 970Evo 1TB NVME Samsung drive, my project files on a Samsung 960 Evo SSD and the media cache on a 500GB Samsung 970 Evo Plus.

I have CUDA enabled, hardware acceleration on (also tried software accelleration) and so on (all of the usual things people suggest, including clearing the cache and restarting Premiere after making these changes to the settings.

However, I'm getting EXTREMELY SLOW export times, regardless of the settings I use and change on 1080P projects.

I thought I found out the problem, which is Windows scheduling Premiere Pro to run on the slower E cores of my hybrid CPU than the P cores, so I installed two programs, "ParkControl" and "Lasso" which allowed me to disable parking on all cores and assign Premiere Pro to only use the six, faster P cores, thus preventing Windows from switching.

This worked! ...for a few days. A 90 second video project that used to export in 3 and a half minutes dropped down to around 20 seconds. I was so happy, as it fixed my issue, and the task manager showed the GPU running at around 80% during export. But, now it's right back where it was a day later.

During export, the GPU doesn't go past 15%, the CPU utilization is just as low, and the video decoder in the 3060 isn't being used at all on export, nor is the iGPU (12600K).

I just spent a few hours trying EVERYTHING I could find. I updated the Intel driver for the iGPU, updated Nvidea driver for the 3060 (tried studio, then gaming then back to studio), played around with enabling and disabling various settings (hardware/software decoding, so on and so forth).

NOTHING works. My export times are back to taking 4-5x longer than the length of the video I'm exporting. I honestly have no idea what the problem is here. The P core scheduling seemed to have fixed the issue for a day or two, and somehow even got Premiere to use the 3060 for exporting running it at about 85% usage, but now it's back down to around 15% and everything is slow again.

I'm seriously considering switching to Resolve if this is an issue with Premiere Pro. I cannot describe how frustrating it is to have spent $1,500 on a new PC for Premiere Pro use, only to have it performing WORSE than the computer it replaced!