I think it wouldn't, as long as the server doesn't wait like 20 seconds or so. Right now, when a level finishes you see this EOL screen with gems and the animation of yourself running out of the screen. It stays there for a few seconds, but you can skip it by pressing Fire. If a client skips it and the server doesn't, the client will wait for the server at the Downloading... screen. I know this quite well because I always start tapping Fire as soon as a level ends. So it would be nice to give that EOL screen a real purpose.



And a note on the ever growing need of high resolution JJ2:
-I'd say allow 800x600 as the maximum resolution for all current levels. Things have advanced way beyond 640x480 by now and most levels should work with it.
-Implement a little user-definable blacklist of levels that are incompatible with resolutions above 640x480. Servers should pass it on to clients to prevent cheaties.
-Define a list of new resolutions that could be used*. Level creators should be able to specify their level's maximum resolution (possibly through an event, which would be much like Battery Check handles water colors in a level, but if it's possible it would be neater to stuff it right into the J2L), which defaults to 800x600. The new resolutions should appear as DirectDraw modes in JJ2+. If technically possible, I'd prefer to eliminate the windowed mode resolution list and make JJ2 a truly resizable application, limited only by the current level's max resolution setting. Otherwise just implement the new resolutions the same way as we've always got the tiny ones.
-Usage of higher resolutions should be turn-on/off-able for the whole server in a server command, dropping back to 640x480.



*Some I could come up with (feel free to add):
EDIT: when you think of it... introducing JJ2 to the World of Wide screens could possibly provide very interesting level design possibilities.