Upcoming release 1.15.0

The next Crystal release, 1.15 is scheduled for January 9.

As usual, this is precluded by a two-week feature freeze period, starting December 25. We’ll be using this time until the release to consolidate the changes and fix bugs.

A preview of the release notes is available: Crystal 1.15.0 is released! - The Crystal Programming Language (PR: #878)

Some of the highlights:

Behind the scenes we’re continuously improving the concurrency runtime and started integrating multi-theaded execution contexts from GitHub - ysbaddaden/execution_context (RFC 2).

You can find all changes in the (provisional) changelog (PR: #15277).

There will be further additions to these resources as we merge additional changes.

The current HEAD of the master branch serves as a preview of the release. We appreciate any report of regressions caused by our latest nightly builds.

Instructions for installing nightly builds are available at Nightlies - The Crystal Programming Language

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Any update for this performance loss regression when enable mt?