Recently I did a round of benchmark on the performance and memory implications for an install of Ibexa Experience. You can find this article with some analysis of results here: Benchmarks of Composer 2.0 vs 1.10 with Ibexa DXP
Björn Köster was interested in if I had did any tests for eZ Platform EE 2.5. I had not, but have now. Similar to with Ibexa DXP, the improvements are significant on 2.0. Scripts used for this (single) benchmark are in other files. See raw results below.
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Composer 1.10: