All the suggestions so far are good, but honestly, the most important thing, more important than the other suggestions here, is:
Rush it!!!!
Practice going faster than you know you can - slightly. If you've never done better than a 50 second memo time, go for sub-50 with each solve. Then when you get it, go for sub-45. Etc.
It really works.
My problem is that I hate DNFs, so I rarely ever go through this exercise. But every time I do, I cut 5 seconds off my memo time.