The following has been released to the Production environments on Oct 14th.
General improvements
Performance improvements to the Activities table. A new table has been introduced in order to achieve some massive performance improvements when having lots of columns and rows. Scrolling should now be more smooth and a better experience in general. Column headers also behave much better now, not jumping around when changing size.
While we have spent lots of effort to make this a non intrusive release, of course it could mean that some things don't look or behave exactly like before