<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
It's also very slow in Pages report.