Downloaded the latest LR 4.1 but I don't see any improvement in speed for things like viewing at 100%. In Library it takes way too long to go from Loupe View to 100% - as long as 5 seconds.
Is your problem that it takes to long to render 1:1 views or that even after library->previews->render 1:1 zooming is slow?
Well here is my problem. I would like to review all my RAW or JPG files quickly. If I go one by one in LR it takes 5 seconds for LR to display each one at 100%. OTOH, I just did library->previews->render 1:1 for 70 5dMKIII files and it took about 5 minutes for that process to complete. So I am just disappointed that LR is not meeting my workflow needs.