@Bryan L Gave you a lot of places to guide you to tweak the settings for your GPU. There is a lot of information there. While it might be included in the infor that Bryan gave, one easy thing you can try is within the Edit page, go to; PLAYBACK. Then check "Use Optimiaed Media if Available". Check "Use Proxy Media if Available". The go, in that menu, to "Timeline Proxy Mode". You will be given the option to do half resolution or quarter resolution in the playback. Also something that you can do in the timeline is right click on the clip and go down to the option of "Generate Optimized Media". That will do what it says it will do and having selected the ability to use optimized media in the Playback menu it will take some strain off your GPU. It is important to note that the playback resolution is independent of the rendering resolution, as long as you indicate the proper render resolution and frame rate in the settings when starting the project. You should even be able to change the resolution after you get started. You can even upscale previously rendered 1080p footage by re-rendering it in 4k, though obviously not as good as shooting in 4k.
As far as the audio goes, I'm not sure if this will help in your situation, but I was having issues with audio that I took with my iPhone. There is a program "SHUTTER ENCODER" Shutter Encoder Link that might help. I'm not sure if you can use it for audio files without video, but it's worth a try. It's a good utility to have anyway. If you have Reaper you might also try re-rendering the audio in reaper at a higher bit rate. I think Audacity, as noted by Bryan, could work too. Here are a list of the Shutter Encoder functions:

As far as the audio goes, I'm not sure if this will help in your situation, but I was having issues with audio that I took with my iPhone. There is a program "SHUTTER ENCODER" Shutter Encoder Link that might help. I'm not sure if you can use it for audio files without video, but it's worth a try. It's a good utility to have anyway. If you have Reaper you might also try re-rendering the audio in reaper at a higher bit rate. I think Audacity, as noted by Bryan, could work too. Here are a list of the Shutter Encoder functions:

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