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About FixPack for 10.3 I'm using this: IDE Fix Pack for Delphi - Version 6.4 (2019-01-12) However, IDE is perfectly stable on my project of 150,000 code lines and I've migrated perfectly from D2010 Pro. Yes, some very annoying flickering with themes, but always responsive. I'm using a PC that is 10 years old now (CPU Intel Q9550, 8 GB RAM, SSD) and I really have a good environment to develop in, with no critical issues.

You didn't answer me: have you got the patch and the IDE fixes I mentioned? Any improvement?

Is there a quick and clean way to creatro auto-snapping forms (that stick to each others) without using subclassing? I've found a way but only with subclassing and I'd like to know if new Rio 10.3 VLC could allow something like that and not to screen borders only.

Thanks,, but I didn't ask about how to inherit a form functionality to a new form, but HOW to implement that functionality! For now I can do that with subclassing, I just wondered if there is a more hi-level method.

I've been using 10.3 CE for a while and I'm quite happy with it. I'm releasing one of my main software in a few days, really satisfied with the development and with the IDE. I never had "not responding" caption or high CPU usage. Only some flickering that really annoys me (I'm coming from D2010 and it was wast!), but I like themes so I keep them, at cost of some flickering. Be sure to ha installed: - december patch 2018 - IDE fix pack from Andy - DDEV extensions 2.85 Let us know if you'll notice some improvment. I'm still looking for an Embarcadero update to Rio 10.3 to better performance.

Operating system: Windows 10. Application, compiled with D2010: no problem even under WinXP. Same applicatione compiled with D10.3-Rio: under WinXP error like "Impossible to find entry point GetProductInfo of procedure into dynamic link library kernel32.dll" I do not use that API "GetProductInfo" call in my code at all! So what's that? In my all life every executable compiled with Delphi could run on every Windows version (from Win2000 or above at least). Please help with some info! Thank you in advance.

Right, that's why I'd prefer to support WinXP in my software. Nice to know there is a rational explanation for this, thank you!

I'm speaking about Delphi 10.3 Rio. Some other smaller projects run too, but I had problem with one my biggest with that entry point, fixed with the "delayed" directive. Odd, because the other smaller projects (that didn't need the fix) had the Windows unit referred too.

The directive "delayed" worked perfectly!!! Great tip, thank you so much!

I'll try that straight now and I'll let you know. Just wait some minutes… Weird thing is that another app I made (much more simpler and smaller) runs flawlessly on WinXP too.

Gosh! That really amaze me... I couldn't imagine. So WinXP is no more supported. Quite a shame. Thank you for the quick reply to both of you.