Compressing working memory is quite expensive in CPU cycles compared to just using it. Identical page merging is also reasonably expensive and only works if pages are, well, identical. Your Electron runtimes are probably not going to be bit for bit identical, not even small sections, due to offsets not divisible by page size. Tuning for better deduplication is possible, but then you're at an awkward mix of caring and not caring about performance.