There will be a match start delay in the next build that will give people time to load up on new map, which should let almost everyone in before the match begins.
If you've made sure your drives are defragged and that your not running a bunch of hogging processes in the background, there probably is not really much else you can do except for hardware upgrades.
We did used to have way faster load times at the expense of higher memory usage in Open Beta 1 when we built the game in a different way, but too many people still run on very low RAM that it ended up causing crashes for a lot of people, so we've had to revert to the slower load times but lower memory usage method. Too many people trying to get their dinosaur rigs to play new games :-P