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I just got a seemingly-random 8.0 MB patch for Portal 2. The Portal 2 News page has nothing on it, nor does the portal wiki. All I found online was a reddit page asking the same question with no answers. The reddit users seem to think it may be a VR patch, but I don't have any VR options in my menu after the update.

Is there any information about what was added/changed with the patch?

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    It is common place to install a large patch containing a future update. If it is VR they would just change a variable to show them when they are ready.
    – Terry
    Commented Feb 2, 2016 at 9:38

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There is a huge thread on steamcommunity.com about an update from several months ago causing Portal 2 to have terrible performance on Macs. According to two users, this update fixes that issue.

This is most anyone currently knows, there hasn't been any official word or reverse-engineering from the community yet.

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This update was related to performance issues on MacOS.

The small 8MB update fixed the performance issues on MacOS.

Only the MacOS Depot Branch was updated with this update and nothing was changed for any other platform.

They just made small modifications in two dynamic library files:

  • portal2/bin/client.dylib
  • portal2/bin/server.dylib

.dylib is the dynamic library extension on MacOS.

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