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Well pyscripter rolled up his sleeves and has made the latest version the fastest one ever. Loading a 10Mb xml file with a a single line or a 120Mb with 3.3 million lines is now amazingly fast, even with highlighting. Thank you @pyscripter for your great work

I have to say that I have never understood why args get prefixed with A and why local variables get prefixed with L. Upper or lower case. I just don't see the benefit.

Indeed there is. That has probably been the trigger to revamp the old style guide to support the newer language features and establish it inside the developer team at Embarcadero. I hope we can expect more consistency here in the future. That doesn't invalidate the argument, though. The standard style is widely spread and most developers are quite proficient to read it. A lot of style guides in the wild are more or less small variations (if at all) of this standard. You won't ever surprise any developer presented with sources following this style. That somehow makes it unique and means it has an advantage.

I would stick to the notation of the Delphi sources rather than using others.

Of course, everyone has its own take on these things. Most preferences just came out of habits. You like what you do and everything else looks strange. That doesn't make one superior to the other if taken out of your own perception. I'm still proposing the original style guide now available in a newer form: Delphi’s Object Pascal Style Guide. Not because it is superior or more readable. A big advantage is that I don't have to switch mentally when looking at the Delphi sources (although they don't even adhere to it everywhere) and my own sources. That said, a style guide is something a team has to agree on and follow it. While this can vary from team to team, it is not a strict law that has to be enforced. That's why it is called Guide instead of Rails. At the end, style guides evolve as Marco perfectly states in his article New Delphi’s Object Pascal Style Guide:

I'm so used to using a prefix "_", that I need many time now to read code with other prefixes (for example "a"). In this situation, i don't need to analyze whether the "a" prefix is part of the variable, i.e. I recognize the variables faster. IMHO. I find the "_" prefix to be an excellent solution! 👍

I still think that the "A" prefix looks bad. I prefer to use "_", which luckily I can get away with, because I'm the lead developer in our company. I'm also with some others here who think that the upper case prefixes, "F" in particular, reduce readability so a lower case "f" should be used instead (but I don't put that into practice). But somehow this feels like an age old discussion, that has been abandoned without a result many times only to start again when an opportunity comes up. And I'm really tired of discussing these non-problems.

I'll be happy to sell you a copy.