Chat mods are usually pretty heavy, if many user are using it may explain the load. Also nv last topic title can be heavy on big dbs. But to start with, do you regularly OPTIMIZE your db ? Because 700mb is the kind of db size that starts to require some special attentions. If you never did, it could...
overall_footer looks like this It looks more like an overall_header.html. Anyway : {SEO_BASE_HREF} should be placed right after : <head> The rest looks ok, but you have installed many other mods, and with url rewriting turned off, if you get issues, it is very likely that it comes from them, becaus...
Bypassing the robots.txt does not make much sense since the robots.txt is only read and followed on a voluntary basis. If the client does not load it, and also it can be loaded but not taken into account.
Ok, so looking at the posting page, I got some js errors all related to the missing onunload_functions that should be defined in your overall_header.html and is actually missing from there (have a look at the prosilver's one since your them is based on it). It is also clear that your overall_header....