According to my perception, installed application will decrease our computer's performance. Cos Windows is required to recognized all software. Besides that, when we uninstall an application, some will leaving it's trace (bin) in our computer.
That's why a software like CCleaner, Revo, and others are created.

That's why I think, when we are using a Portable Application, it will not effect our computer performance.
This is just perception only ... I don't know it is RIGHT or WRONG.
Would everybody willing to leave his opinion regrading to this matter

Until today, I don't know what is the disadvantage by using Portable Application. (Cos I wish to place it on C drive and use it.)
Please informed ...