Proteus 8.1 Portable 64 Bit is recommended for:
However, users with complex or high-end design requirements may want to consider other EDA software options, such as Altium Designer or Cadence OrCAD. Proteus 8.1 Portable 64 Bit
Why would an engineer or student choose a portable version over the official installer? Here are the compelling reasons: Proteus 8
Cause: The portable sandbox may be throttling CPU threads.
Fix: In Proteus, go to System > Set Animation Options and reduce the "Animation Speed" or disable "Show Wire Voltage by Color." However, users with complex or high-end design requirements
Just because it’s portable doesn’t mean it’s stripped down. Version 8.1 includes: