Firstly thanks a lot for that technique Dan, it works perfectly. Just putting the markers on a separate layer to move them. But Adobe should let you select them all and move all at once, seems pretty basic to me. It’s is also weird that there is a such a long delay, ive got a pretty good pc and there shouldn’t be a delay THAT long (1 second).
In reply to DaMasteRZ’s comment. Ive had the same problem with my projects too. There are a couple of things you can do.
1) I think this is a problem with encoding and various codecs… i was having this problem on .mov files and other, so its not just .wma . To fix this is set my comp size to a standard. Pick one of the ones here (https://en.wikipedia.org/wiki/Image:Vector_Video_Standards2.png) I use 720p which is 1280 x 720 pixels. I find by setting it to a standard size that codecs know it renders to the format quicker and there is less problems.
2) Pick a good codec to use. I find H.264 is the best one out there. Then play with the settings to get the quality/file size right. Really pump up the bit rate to get good quality.
3) Uninstall any codec packs etc if you got any, and then install FFdshow. This is the best codec software and is free. Get the latest version from here: https://sourceforge.net/projects/ffdshow-tryout/
Tell me if its works out for you