Learning platforms and speed

Further to the comments I have made before about the 'click and wait' syndrome when people are using the web to present something to me is another consideration;

What effect do webpage load times have on usage of learning platforms?

I ask because of a blog I read about some research google have done that says that for every half a second on the load time for their search results they get a 20% drop in traffic.

Wow. Most learning platforms in use are much slower than google. Maybe one of the ways to increase adoption in classroom is to ensure speed performance is a high priority when evaluating learning platforms?