This is a normal process, and a feature that allows Memory Manager to compress infrequently accessed memory pages. You may want to run a memory test to be sure there are no faults in your RAM, also make sure you install all updates as I believe this process has had one update since it's introduction. I believe this compressed memory may be flushed to a disk store, so if your hard drive is slow for some reason it could affect the speed of this operation greatly.
For those of you with Insider Hub installed, you can open the following link in Edge and it should open in the Hub:
insiderhub://announcements/4ff2fa6c-cf48-4ee5-990b-437010db59af