The initial page of the master account runs a bunch of stats and what not telling you how well you are doing. The problem with this: as the month goes by, logging in takes longer and longer. Here towards the end of the month login time for me takes up to 30 seconds long.
Solution.
Disable those pesky stats.
You just need to comment out one line in the file
admin/home.php
Code:
#include "./main.php";
Bingo! Now you can log in right quick and save those great stats for another day. As far as I know, this won't blow up your cart, but no guarantees.