Merge pull request #654 from deborahc/patch-4

New known issue for IntelliTrace step-back

Author: Mikejo5000

docs/debugger/how-to-use-intellitrace-step-back.md

@@ -103,4 +103,6 @@ The impact on overall stepping performance depends on your application. The over
     Workaround:
     * Clear all snapshots by ending the debugging session. 
 
+* When debugging an application whose process has a high number of unique memory regions, such as an application that loads a large number of DLLs, stepping performance with snapshots enabled may be impacted. This issue will be addressed in a future version of Windows. If you are experiencing this issue, reach out to us at [email protected]. 
+
 * When saving a file with **Debug > IntelliTrace > Save IntelliTrace session** under events and snapshots mode, the additional data captured from snapshots is not available in the .itrace file. On breakpoint and step events, you see the same information as if you had saved the file in IntelliTrace events only mode.