WinTop is part of the Kernel Power Toys. It's downloadable . Follow the unzip instructions, then read Wintop.txt. The Microsoft Web page says the toys are only for Win95, but I run WinTop under Win98 all the time with no problem. Another trick that can improve performance in Windows involves the swapfile.
Many readers configure their swapfile to be the same size all the time.
This saves Windows the overhead of increasing and decreasing the swapfile's size as you work. But the truth is, the less RAM you have, the larger the swapfile you need. The best way to determine the proper size, therefore, is to make the size appropriate for your system. In Win98, run Sysmon.exe. If this graph isn't visible, pull down the Edit menu, then click Add Item, Memory Manager, Swapfile Size, OK to make the graph appear.