Copy and paste this link to grab the file if you want.
I loaded and viewed your drawing from within TC 16.2. It took less than a minute. Didn't time it particularly. This seems reasonable for the size of drawing. TC did mention not being able to find several bitmap files, which are not available on my machine.
Otherwise, it looks fine - rather a large development area!
I see 72 blocks listed, again, this is not excessive. You would need to go through these, one-at-a-time, to find any debris!
It might help to split the drawing into component parts, using xrefs to build the final images, as required.
Hope this helps.
You can design without engineering, but you cannot engineer without design.
Using Win 10 with Designer 2016/2017 and TurboCAD Pro. Plat. 2018/2019 + Lightworks (64-bit versions) + AnimationLab 5.2.
Windows 10 Pro (1909) 64-bit