Just be aware that if you xref a file with a lot of TTF text, the resulting drawing will become EXTREMELY slow to open. We have had some take as much as an hour to open due to the number of xrefs that had TTF fonts in them, we changed them to SHX in all of the xRefs and the same file opened in under a minute.
I'm not noticing this... Maybe you could define "lot of TTF text"
Is it possible it was applying font mapping or alternate font substitution for TTF fonts not installed?
I would say about 5,000 individual pieces of text per drawing, with about 50 different text styles. With approximately 15 drawings (all with this) xrefed into our drawing. So this results in about 50,000 individual pieces of text with about 500 text styles referenced into one drawing.
The drawings were not created by us, we simply have to use them as our backgrounds.
This was definitely the cause of the problems, because all w did to fix the open times was change everything to SHX fonts and it disappeared. Now, it could be some combination of being a TTF and have text rotated or width factors defined, etc. but changing to SHX fixed the problem.
We only made the switch because AutoDesk told us that this was the problem that was causing the slow down and sure enough, they were right.