I find the jumping training the most boring of them all... Waiting for randomly falling rocks to form a tower in such a large screen. Waiting for the gaps in the ground to be on screen, actually, past the screen, so you don't hit the wall and fall into them. The last one is the least tedious one...
"get me a 500k worth diamond engagement ring, that's what I want, but for some reason I'll ride a rocket dragon thing and throw dynamite at you so it''l be harder and take longer for me to get the ring I want"
Turn down the quality and turn off image effects in the options menu, and let me know your computer specs if that doesn't help :)