Simple maxscript command to replace a bunch of objects to one:
instanceReplace selection (pickObject prompt:"Pick instance source!")
It isn’t just simple replacer, but it make instances. So if scene contains thousand and thousands objects, differences in rendertime can be really huge.
GUI version:
The good thing is that it leaves original objects material, keyframes and scales. You can easily use it on post-baked particle meshes.
Download Instance Creator v1.2
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Changelog:
1.2 – Progressbar while replacing.
1.1 – Added button to select picked object.
1.0 – Better performance on huge objects count.
0.9 – Fixed possible errors on current selection catch.