Hello,
I have the same problem, on RDP or logged on the actual computer and the problem occurs when using any program, not only on JRiver!!!
I couldn't find any hard evidence on Task Manager of system stress or any culprit.
Really annoying, trying to write something and the keyboard freezes and after a few seconds resumes... Sometimes just stays really slow for a few seconds.
Have been struggling with it for ages and couldn't find the problem.
I have followed every performance tip and suggestion on JRiver's FAQ to no effect.
I have excluded every JRiver's folder exe on Windows Defender, including the full folder.
Always using the most recent JRiver version. Payed upgrade every year for many years...
I believed the cause was my 10 year old PC...
Then just built a new PC last week (top tier), Intel 12900k CPU 32GB RAM, 1TB NVME (Samsung 980Pro), fresh windows 10 install, fresh JRiver install, reused JRiver db. The problem remains!!!!
After 1 week of maddening search, trying to enable/disable all installed software, exchanging keyboard, trying different USB ports.... found that shutting down JRiver Media Server and JRiver Media Center, the problem disappeared.
Since I use JRiver to catalog and listen to my huge digital lossless music collection this is really a big bad "no no". It's back to Foobar2000 again