I have been looking over the layout I'll be more than happy to make any suggestions that will speed up the db and queries. I'm also downloading the latest CSV today or tomorrow I was a pretty decent C++ coder back in the day never got into writing gui apps in C++ but could code a mean DOS app
I would suggest exploring the new innodb storage engine instead of using MyISAM files. They are fast ACID compliant and don't suffer some of the locking issues MyISAM does. On the structure side I would change the grid table and break it up so your pathing isn't limited to 50 way points. Also there are alot of text or blob fields that may not be needed in alot of cases people dump data that should be broken up and stored in a blob and parse through it on the program side of the app instead of storing it properly in the first place. I'll know more after this week for sure though. I love the emu it has come a long way since the last time I took a peek
Wes