<b>Fatal error</b>: Allowed memory size of 536870912 bytes exhausted (tried to allocate 88 bytes) in <b>/home/piwik-demo/www/demo.piwik.org/core/Metrics.php</b> on line <b>196</b><br />(I since reverted memory limit to 256M)
Expected: report loads fast and does not use more than 256M of memory
That's a bit a random requirement. How much does it actually take? Can you increase to 1GB and see if it works and how much it actually uses?
I think it'd be better to check if we can find a memory leak or something but a 512MB memory usage might be valid
After changing memory limit to 1024M, the row evolution loads. It took 1 min to load the report (period month) which is quite slow.
This only affects the "User cities" report, other Row Evolution reports load very fast