I got in contact with the author of the software that I use to generate the route maps. He agreed that the program seemed needlessly slow. He looked into it and suggested I run a couple indexes on the database holding the data:
create index idx_gpstime on gps(time);
create index idx_obdtime on obd(time);
After this, the program runs in approximately one minute, versus something like one week before the optimization. That works out to a speed improvement of about ten thousand time. Wow.
So I generated the file and it is about 25 megabytes, which is too large to upload to the same place I keep the other KML files, and also too large for Google Maps to accept. I don't know what to do about that, but for now I'm just going to do nothing.
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