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By default the IDE enables optimization and disables Range checking and Overflow checking. I've always found that odd, because I want the best possible compiler support for debugging which means: Optimization off Range checking on Overflow checking on

+1 for @Dany Marmur except for specially optimized and proven to be good functions/units.

Those licenses could also be revoked after some time by Microsoft. You will never know beforehand. https://www.howtogeek.com/392080/cheap-windows-10-keys-do-they-work/

Yes but the real question is: why do you want to switch to DUnitX when you have working DUnit tests already?

No, there is no such option. You could add a unit alias for it, that redirects to a unit that's already there, e.g. SysUtils. Then the unit would still be added to the uses list, but would not be compiled into the executable.

The feature is unlikely could be disabled but you could try to cheat it. Just create empty unit FireDAC.FMXUI.Wait.pas inside your project's folder.

I would consider setting this to 0. Unless you're sure you want your web service to halt when there are a lot of people at once, which seems like the very thing you'd like to avoid. In the work I've done with ISAPI (not using Delphi's own TISAPIApplication though, sorry) I just keep queueing incoming requests in a queue the thread-pool can take from with any worker thread that happens to be available for work... (Though I seem to have written a comment there to consider doing something when there's a lot of incoming requests...) The rationale would be that other things would fail first before your thing does: memory runs out, or network sockets run out, or IIS runs out of execution contexts (and throws 503 itself when it deems appropriate...

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you are right, it wont. this is all what happens: if (FMaxConnections > 0) and (FAddingActiveModules >= FMaxConnections) then raise EWebBrokerException.CreateRes(@sTooManyActiveConnections); Calculating the max allowed concurrent user depends on many things and there is no exact formula. You could do some stress-test to see how the server works under load. This would also test how your dll and connection pool are performing, are there deadlocks, unexpected behavior, etc...

No, they are not - apart from alignment as David pointed out it depends on the data type - string, interface or dynamic array assignments for example are far from being atomic.