Not talking about differences in speed particularly on today’s average home computer, just keep in mind, that the XP is capable to utilize much more resources of modern hardware, for example more than 512 MB of RAM and therefore will show better performance in intensive tasks (audio and video transforming), where Win95 (with its 98 and Me relatives) won’t work at all. The speed will be zero for such machines with Win95-coded OS installed, unless some resources are disabled or reduced.
But software, a particular user program is still the most important factor in OS comparison. What are you going to install, to run, to compare on NT-based vc. Win95-code-based computers, what are your tasks? You have to tell this first. It might happen that DOS 6.2 would be the fastest OS for your tasks.
Do you remember that comparison reviews the time when the Windows 95 was introduced?
Even in later Tom’s reviews we can find: DOS 6.2 is the fastest and best OS for games and office applications on Pentium II machines. Does it say you anything on your question?