3D-PDF performance for 64-Bit version is so terrible. Our company is therefore still using 32-Bit version, which has other issues when many files open. Such as: "out of memory error", missing content, white pages and other random errors

Also the fact that 32-Bit Acrobat Pro/DC can't render 3D-PDFs properly with "Enhanced Security Settings" on is a bit questionable. All employees working with 3D-PDF have to turn this option off permanently.