@domie-cat said in [Windows 7]Opera slower and slower:
... It is possible that my problems are due to the fact my computer is very old with many unecessary files that slow it
How much RAM does the computer have installed? If it's low (eg: 4 gB), the system may be running out of RAM and be forced to swap in-use files in and out of Windows' allocated virtual RAM on the hard drive - which can definitely slow down everything, especially for a browser dealing with modern websites.
Also, if you are running other applications and their processes while Opera is running, that can also eat up RAM and slow down a marginal system... make sure you don't have much else running while browsing.
Finally, check the free space on your hard drive... if the drive's nearly full, it can slow down the hard drive significantly as it has to jump all over the place to try to chain together enough unused space to access or write files while browsing. In that case, clear out un-needed files, etc from the drive to significantly increase free space.