@Manuel
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Everyone will see a jump a bit after their first update to these versions as we have a background process that will revisit every GRP file for each user. We do this because there is some additional information the CFG now stores, such as "HasCalendarItem" for example. This process happens in the background after a user is loaded for the first time, it happens in the background without interrupting the user but it does put load on the server. This only occurs once per user after the update to one of our recent versions, so after a couple days you should no longer see this.
This background process uses a maximum of 5 threads (on a 8 thread machine that's half your CPU). This process will also cause us to use more RAM than normal because we cache items that are recently loaded, and if were loading everything a user has we're technically caching quite a bit.
This process I'd expect large servers to finish in a day or 2 with some users being trickle updated throughout the week as they log in for the first time. User's with mobile devices will hit the server first and be visited first. I know there are other CPU/Mem concerns and we are looking a profiles as we get them. Hopefully this helps explain what the initial jump could be after upgrading in some scenarios. If you have been running for week+ on the current update it very likely that this ISNT what your seeing, but if you recently updated likely IS what you are seeing.
EDIT: You can adjust mailbox_subversion_upgrader_thread_count in your server's settings.json if you wish to speed up or slow down this process, though it still requires your users to be touched (they login, they receive an email, etc) before they upgrade.
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Matt Petty
Senior Software Developer
SmarterTools Inc.