I just installed Delphi 10.4.2 and compiled a huge customer’s project. This project has about 2.3 million lines of code. Normally it is written and maintained with Delphi 10.3.3 Rio. For working inside the IDE it is compiled for Win32 since the DCC32 is the fastest Delphi compiler.
I just did a test and compiled the project in 2.5 minutes which is a very good result and shows how fast the DCC32 is. But then I compiled with 10.4.2 Sydney and could compile the whole project within incredible 1.5 minutes! This means that the turn-around times for daily work is about nearly the half! That is why my recommendation to all Delphi users is: Move to the latest version 10.4.2 Sydney immediately!