[amelius]

> instead of one Chrome instance, I'm now running five which use more than one GB of RAM each

Is that true? Executables and shared object files are supposed to share (code) memory.

So what big data structures does Chrome use that it can share between tabs (which are processes) and that it can't share between different instances of Chrome?

[_pmf_]

> Is that true? Executables and shared object files are supposed to share (code) memory.

Different version - different DLLs

[amelius]

Ok, so it's a version management problem then.