dlesaux
Does a single instance of a 32 bit VST adversely impact performance on a 64 bit system?
For all practical purposes, no.
dlesaux
Does it limit my RAM size, slow down processor speed, suck up system resources?
Each 32-bit plugin will be limited to <2GB RAM, but that won't affect the overall project or other plugins. Only sample players need more than that. Software synthesizers and bread 'n butter DSP effects (compressors, reverbs, equalizers, etc.) don't.
It will not cause a measurable increase in CPU or other resources. Sometimes, 32-bit versions can be slightly more CPU-efficient. Occasionally, the 64-bit version performs slightly better. The operative word being "slight".
Most important, 32-bit plugins
sound exactly the same as their 64-bit equivalents, contrary to some uninformed opinions previously expressed on this forum.