Is rebasing DLLs (or providing an appropriate default load address) worth the trouble?

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Patching the relocatable addresses isn’t the big deal, that runs at memory speeds, microseconds. The bigger issue is that the pages that contains this code now need to be backed up by the paging file instead of the DLL file. In other words, when pages containing code are unmapped, they need to be written to the paging file instead of just getting discarded.

The cost of this isn’t that easy to measure, especially on modern machines with lots of RAM. It only counts when the machine starts to get under load with lots of processes competing for memory. And the fragmentation of the paging file.

But clearly, rebasing is a very cheap optimization. And it is very easy to see in the Debug + Windows + Modules window, there’s a bright icon on the rebased DLLs. The Address column gives you a good hint what base address would be a good choice. Leave ample space between them so you don’t constantly have to tweak this as your program grows.

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