I have problem with video playback on some pages, frame rate is something around 10-15fps whereas one CPU core is fully loaded (I'm using Intel i7). Example of such page is at aol.com - i get to it from the default Maxthon's home page
Please try this one for example
Note: it uses flash for playback.
Note: i've checked i'm having the latest version of flash according to this thread http://forum.maxthon.com/thread-13920-1-1.html
The same plays absolutely fine in Chrome - no 'slugishness' and CPU usage is around 3-5% (of all 8 cores), Maxthon takes 15% (this is more than 1 complete loaded CPU core).