This hints to another issue besides graphics and one I found out recently when I loaded up a bunch of very nice Amtrak Amfleet passenger cars. A few of them were okay but having a lot of them sent the program into a fit. When I deleted a bunch of passenger consists with these, my track and other splines drew in fine and quite fast too without the big crawl or big blank spots on my 200-plus mile route I started in TRS2004 back in January 2004.
While I was troubleshooting the problem, I checked the Client Logs. In there are a bunch of script errors and warnings related to the same passenger cars. Hmmm... I should've seen this as a red flag, no pun intended, because there were lots and lots of them.
The problem is an outdated or corrupted script will hog resources causing other processes to lag behind until the script times-out or is forced closed by the program. This was always a problem and worse in TS12 and why some scripts now have timeouts.
What this means is scripts can also cause the graphics not to load as they bog down other functions and consume resources. When the graphics developed the slow load, I had AI drivers acting weird, or weirder than they normally are due to these scripts blocking their function as well.
A simple way to find out if this is the issue is to pause the program while in Driver. This will give the graphics part to catch up and get ahead of the scripts. The other clue is being in Surveyor. While in the route building mode, everything draws quickly, but while in session-creation, the graphics start to draw in slowly just like in driver.
A more complex way is to enable some options in the Dev tab located in Trainz settings on the Launcher. If you want to try this, check the following boxes:
Enable advanced debug tools - I always enable this.
Show script exception notifications ---- this will show the infamous red bug.
Log script output ---- this will put this to a log window that you can view later, and finally
Log script message handling ---- just as the option says. I found this to be a bit too much for what I was looking for and disabled it.
Once I used other Amfleet cars by PerRock, which sadly can't be downloaded right now due to his website being down, I had no problem afterwards even with the same number of Amtrack passenger trains pulling Amfleet cars.
