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The auto refresh of Windows File Explorer has been a long standing issue with Windows. There are a number of fixes for this issue posted on the internet, but every version of Windows 10 seems to have a different solution. I personally just live with inconvenience because the next Windows update could "un-fix" the problem you thought you had solved. I don't have enough time in my day to manually apply "fixes" to Windows that might be wiped out next week on an update. So, if I need to refresh File Explorer, I just hit F5 and it will refresh. I also use a third party File Manager and it has

Yes. But YMMV. Mostly, having the cache on a different drive means that you're separating out the I/O load, which can definitely improve performance. Though, this depends on the SSDs you're using. Things like AHCI vs NVMe, and the IOPS rating of the drive make more of a difference.

I'd take a wild stab and say probably negligible difference so long as windows is idle and behaving; checking task manager, my fileserver's boot SSD is currently averaging ~1% active time, ~450 KB/s transfer rate, ~1ms response time and <0.01 queue length over 60 seconds at idle, and it's a rather old SATA SSD. I think you're much more likely to run into other bottlenecks first. But YMMV as it depends how many simultaneous streams are you planning for, what other background programs you have running, etc. You could test it? Open task manager / resource monitor, set to show the drive's