added info about frameskip

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@792

README

@@ -111,6 +111,36 @@ FAQ:
 
 4. Check the site/forum.
 
+
+To run resource-demanding games: 
+===============================
+
+DOSBox emulates at the CPU, the sound and graphic cards, and some other
+stuff, all at the same time. You can overclock DOSBox by using CTRL+F12, but
+you'll be limited by the power of your actual CPU. You can see how much free
+time your true CPU has by looking at the Task Manager in Windows 2000/XP and
+the System Monitor in Windows 95/98/ME. Once 100% of your real CPU time is
+used there is no further way to speed up DOSBox unless you reduce the load
+generated by the non-CPU parts of DOSBox. 
+
+So: 
+
+Close every program but DOSBox 
+
+Overclock DOSBox until 100% of your CPU is used (use the utilities above to
+check) 
+
+Since VGA emulation is the most demanding part of DOSBox in terms of actual
+CPU usage, we'll start here. Increase the number of frames skipped (in
+increments of one) by pressing CRTL+F8. Your CPU usage should decrease.
+Go back to step 2 and repeat this until the game runs fast enough for you.
+Please note that this is a trade off: you lose in fluidity of video what you
+gain in speed 
+
+You can also try to disable the sound through the setup utility of the game
+to further reduce load on your CPU. 
+
+
 Building your own Version DOSBox:
 =================================