As promised (after 3.2 is out), here is hopefully better display update rate detection feature.
http://www.winuae.net/files/b/winuae.7z
Add "show_refresh_indicator=true" to config file to enable it.
Bar appears in left border:
Grey = line was last changed 1 frame ago
Green = line was last changed 2 frames ago
Blue = line was last changed 3 frames ago
Black = line was last changed 4 or more frames ago.
In other words: constant grey = every frame updates. grey/green flicker = 25Hz and so on.
It compares bitmap data only, color changes or sprites don't count as changed.
Note that it may increase CPU usage noticeably. (All lines must be checked and redrawn all the time)