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I just found out what is wrong with my Delphi IDE Explorer in Delphi 10.3 Rio. The symptom is that the Follow Focus option and the Select Active button no longer work in some forms, in particular in the options dialog (Tools -> Options / Run -> Parameters / Project -> Options). The reason is that this dialog now uses the Screen.OnActiveControlChange event itself ... https://blog.dummzeuch.de/2018/12/09/delphi-ide-explorer-is-broken-in-delphi-10-3-rio/

To summarize: Who wants maximum performance like "classic" use it like this var obj := Shared.Make(TTestObj.Create)(); "obj" is object and will be free it at the end of the procedure; otherwise, use it: var obj := Shared.Make(TTestObj.Create); "obj" is interface and will be free it at the end of the block and every access has a small penalty of an anonymous method call.

The DDevExtensions 2.85 and the DFMCheck 1.6 are now available for Delphi 10.3 Rio. DDevExtensions Changelog Added: Support for Delphi 10.3 Rio Added: Use Unit dialog option “Every unit on a single line” Improved: UnitSelector Dialog in Delphi 2009 opens much faster Fixed: Structure-View search dropdown had a max height of 2 items Downloads

Out of the three options, the first two are fine, the last one is a terrible idea. Don't do it. You just create loads of extra work for no benefit.

That’s because functions with record (and other structured) return types are really implemented as hidden var-parameters. IMO, they should have been implemented as out-params, to get proper warnings. Alas, functions returning structured types preceded support for out-parameters (IIRC), and they never went back to fix this.

One of the improvements in Delphi Rio is the upgrade of PCRE to version 8.42 and more importantly the inclusion of UTF-16 support on Windows. What this means is that Delphi strings are no longer converted to UTF-8 and back when using Regular Expressions. This blog post describes a benchmark of various regular expression options. I wanted to see the impact of the Rio improvements and here are the results. The results below use the test suite of the above mentioned article. Delphi 10.2: Total Time: 12639.00 ms Delphi 10.3: Total Time: 10614.00 ms (about 17% faster) Further improvement can be achieved by using PCRE Study. Fir a bit of extra compile time you have significant execution benefits. You need a class helper to use Study with TRegEx: type TRegExHelper = record helper for TRegEx public procedure Study; end; procedure TRegExHelper.Study; begin with Self do FRegEx.Study; end; You can call study after TRegEx,Create. Here are the results with Study. Delphi 10.2: Total Time: 9863.00 ms Delphi 10.3: Total Time: 7895.00 ms (about 20% faster)