Unicode characters in text editor problem

In a text editor window, using Unicode national characters (Greek in my case), there are accented vowels that register with two keys from the keyboard (eg: ά, έ, ό … etc). If I type the 2 key sequence fast, the accent is missed, slower works. Is this a delay that can be set in Blender, or an interpreter lag that cannot be adjusted?
Actually I think it happens everywhere (not only text editor), but it’s especially nagging problem in a text window, where I may type whole paragraphs and almost each word has an accent.

Anyone that can help with this, please?

By the description of the problem (quick fails, slow works) it sounds like you’re indeed hitting the limitation of event processing system in Blender. It handles events in a very straightforward manner. In that, a press followed by a press is different from a press followed by release. When you’re typing quickly, you might be pressing the next key before releasing the previous one, and this can (and does) lead to an apparent misinterpretation of events.
In itself, that’s not a bug. However, I’d suggest that you report your issue anyway on https://developer.blender.org, in case there’s something else at play here, or if they’d see a way of making quick typing combos work.

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Thank you, I filed it with developer.blender.org

So this is different than the way most software handles keyboard input? I can imagine this being useful with certain special keys likes shift, alt, control or function keys, a common interpretation for all software. Must be different applied to letter keys, since I don’t have the problem elsewhere. How is that uniquely useful to Blender functionality? And can I turn it off?

If the cause is indeed the way that events are processed, then no, you can’t turn it off. Why the current design is the way it is, I cannot say.

It has been added as a project task under : User Interface, by Blender Dev team