https://bugs.winehq.org/show_bug.cgi?id=31209
--- Comment #5 from Sebastian Lackner sebastian@fds-team.de --- Since more and more people are subscribing to this bug report - this feature request was also submitted to the wine staging team, and we decided that it doesn't make sense to include it. Samepage merging has a lot of overhead in situations where it is not required, and running the same game multiple times is really more an exception than the usual situation.
Take a look here for the full discussion: https://github.com/wine-compholio/wine-staging/issues/184
When adding such a feature, it should either it be possible to enable/disable it at runtime, or even better use some more intelligent logic to enable it only for pages which are shared across several processes with a high probability.