So there are some interesting posts on the Compressed Memory feature. I doubt that is causing your problem. The System and Compressed Memory is just a rename of the System process from earlier versions of Windows, and it was done, because when Windows compresses pages instead of writing them out to the page file, then the get stored in the System process, and people were wondering why it's ram usage was large at times.
Anyway, the System process includes all the Windows Kernel items, so when your network interface receives data, the System process deals with it, determines which user process should get it, and passes it on; so the CPU time it is using
might be justified. You can monitor with the
Windows Performance Toolkit to find out what the System process is actually doing.
Anyway, some interesting threads:
Details of Windows 10 Memory CompressionHow to disable Windows 10 compressed memoryThread with several people experiencing high CPU usage on System and Compressed Memory process <- reading through this indicates that it can also be caused by the ACPI.sys driver, a NVidia driver, having a MicroSD card sitting in a slot, and probably some other things too. Mainly it points out you should be using the WPA to find the cause.
Also, don't believe anyone who says you need a specific sized paging file (especially the rule of thumb 1.5x memory). The only way you find out what paging file size you
need is by monitoring the machine and it's page file usage during a "normal" load. The issue with a home PC is it doesn't really have a normal load profile. You will only every get general recommendations for a home PC. That said, my page file is set to 6GB. 2GB on the OS drive, 4GB on the other drive. This is because Windows always requires a page file, if only to store the modified list. At a minimum you should allow 1GB for this minimum. I put it on the OS drive so I don't remove that drive

. The other 4GB is a Just In Case because I cant be bothered monitoring. However with 32GB of RAM, I've never got to the point where Windows needs to actively page anything out. The maximum I've ever has used is around 28GB, so there has still be 4GB free, and that was only because I was doing something stupid. Normally I'm lucky to get over 19GB used.
Mark Russinovich (who I'd believe over the standard MS phone support) had some info on the paging file in
this blog post. IIRC there was a heap more detail in the Winternals Books or maybe the System Administrator reference.