Actor builds now use 4 GB of memory for paid plans and actor developers

We had feedback from developers that more than 2 GB of memory for actor builds is needed, especially for multi-stage actor builds. To fix this, we have increased the memory allocated to actor builds to 4 GB while also boosting other resources necessary for the build process. This change applies to all users with paid plans and paid actor developers. The enlarged memory allocation will increase the cost of running your actors. However, the amount is negligible in comparison with other resources.