-Extract to a different drive tan the .7z archive is stored on
-Don't use drag n drop as this will first extract the files to Temp, then copy them to the destination, then delete the files from Temp (or just leave them behind, wasting space)
-A faster CPU with more threads helps. Hyper Threading also makes a difference
-Faster RAM might actually help
-If the extraction is slower than a regular file copy, you're probably not IO bound. However if it's the same speed as a regular file copy, a faster drive (or SSD) might help