We found a memory leak in the http-client lib. This is a widely used lib, so the bug affects most installations. The bug has been fixed in our new 6.10.1 release. Technical details may be found here: https://github.com/enonic/xp/releases/tag/v6.10.1
Download the release from our download page: https://enonic.com/downloads
We hope you will enjoy this release. Please let us know what you think in the comments section below.