Will RJL System Cleaner speed up my computer?

We do not make that claim, and you should be skeptical of any cleaner that does.

What RJL System Cleaner actually does is recover disk space by removing files that serve no ongoing purpose. On systems where the hard drive is nearly full, freeing up space can improve performance because Windows needs free space for virtual memory, temporary files, and updates.

If your computer is slow, the cause is almost always something else -- too many programs running at startup, not enough RAM, an aging hard drive that should be replaced with an SSD, or malware. A system cleaner does not fix those problems.

RJL System Cleaner is honest about what it does: it recovers disk space and cleans up privacy traces. That is valuable on its own without making exaggerated performance claims.