I see 1.8GHz in glances (in my case actively cooled, but since it doesn't seem to max any core, it probably doesn't matter). I have other RPi4s, I wonder why is backend in Java (well, Scala) ok, backend in Haskell ok, but backend in PHP wouldn't be? I still don't understand how Nextcloud can lock up for so long (tens of seconds) on a simple write event into calendar operation. That hacky unoptimized Java BE which does joins manually and inserts sequentially (so from a db perspective just awful), handles 5-10 times more data and still does it order of magnitude faster. My old phone which was weaker than even RPi4 could handle dozens of such small operations in one second (I believe that was SQLite + Java). There must something seriously wrong with Nextcloud (including PHP runtime) and/or the RPi, because such insignificant amount of data (1 word title, one date, one reminder option), most likely merely few dozens of bytes, takes so incredibly long to process and write to db...