if this is the same file as your other problem extremely strange zooming then @pascal is right and your objects are “very far from the World origin”
try:
_SelAll _BoundingBox _CoordinateSystem=World _Enter
check the dimension-Result written in the command Line History (F2-Key)
or try:
Save your file with new Name, use option "save Small"
close and reopen the “small” file. All Rendermeshes will be recalculated.