As discussed during the last team meeting, I did some profiling to evaluate the performance of 4.4 series against 3.5 series. I used xdebug for profiling and for each of the pages evaluated, I averaged among three reading to overcome any errors.

The values are in milliseconds and contains profiling overhead as well. However, this should not be a problem to compare between two versions.

Page	3.5 branch	4.4 branch	4.4 / 3.5
Table browse	5230.67	24548.67	4.69
Table structure	2974.67	8060.67	2.71
Table SQL	760.33	1770.33	2.33
Table operations	2564.33	7626.33	2.97
Row edit	2012	10980.67	5.46
Row insert	2387.67	11553	4.84
Database structure	6280.33	5076.33	0.81
Database SQL	1511.67	1570	1.04
Database operations	3115.33	2750.67	0.88
Server databases	2108	3068.67	1.46
Navigation refresh	626	4092.33	6.54

While I got mixed results where for certain pages 3.5 was faster and for others 4.4 was faster, for most of the pages 3.5 was much faster.

I am attaching the results in csv format as well as output files from profiling. With KCacheGrind or WinCacheGrind you should be able to further analyze the profiling results.