windows defender issues? & other AV issues?

JJS jjs at
Mon Jan 7 23:06:26 CET 2019

Speed, what are we talking about? milliseconds?

It depends on where you need speed for.

Overall i find it working great with enough speed.

I work with a very known American company, and the software they use is 
about to cry. screen flickers, it's as slow as hell and everybody has to 
work with it, period. It was introduced about 3 years ago.

It's probably written in C. Waiting for screen updates can take up to 10 
to 20 seconds. And they use it worldwide, the mainservers are in the US.

And they don't give a sh*t that everyone hates it and complain, because 
they paid for it. And managers above managers...someone introduced it, 
holy grail, you know.

I added .rev .livescript and livecode.exe to Windows Defender and have 
not had an slow issue since and keeping fingers crossed.

Microsoft will probably not be interested that LC will run slow due to 
their product.

Op 7-1-2019 om 21:45 schreef Richard Gaskin via use-livecode:
> Curry Kenworthy wrote:
>> Since Windows Defender is fairly unlikely to be the oh-so-sneaky 
>> culprit when similar issues show up running the LC 9 Script Editor on
>> the Mac platform...
> And now the issue has become doubly conflated.
> To review, there are two issues in this thread:
> a) Windows Defenders "Real Time Protection" is widely documented
>    across the Internet to have caused unusual slowdowns in a great
>    many applications. LiveCode is one of those applications.
>    My interest here is in seeking details on the cause of that
>    Microsoft issue so we may determine if there's an opportunity
>    to modify something in LC to move it from the category of
>    known affected apps to those that are unaffected.
> b) Some third-party AV packages will from time to time flag LC apps
>    with false positives, easily remedied by working with those vendors.
> With your addition, we now have a third concern introduced unrelated 
> to AV handling:
> c) The performance optimization efforts demonstrably under way with
>    LC's v9 series are not yet complete.
> If the performance issues you're seeing on your Mac are equal or greater
> than those seen by bug reporters on the issue which is the topic of this
> thread, that is notable of course but the subject of a separate
> discussion.  Any Mac-specific issues merit their own bug report as 
> well, just like the one we're discussing here which you had flagged as 
> a Windows issue (#21604), and which led to the discovery of the 
> contributory effect of Windows Defender.
> While it is apparently of great interest to discuss more general
> performance issues in any thread where the topic may be plausibly
> inserted, there is a key factor with the subject at hand which you may 
> not have noticed in the comments in your bug report:
> Those who have disabled Windows Defender's Real Time Protection find the
> issue immediately resolved.
> Yes, as discussed at length in so many other threads, other
> opportunities exist to further optimize LiveCode beyond the significant
> gains made in the v8 and v9 series thus far.  So we would expect
> evidence of remaining issues to show themselves on other platforms than
> the one we're discussing here.  You may consider starting new threads 
> on new subjects of interest to you.
> Back on topic in this thread, I agree with your assessment here, that 
> if there is an opportunity to alter LC so that it no longer triggers 
> this well known Microsoft bug, it probably isn't in the script editor:
>> As I've also predicted previously in that bug report, it's a 
>> better-than-average bet that the LC 9 Script Editor is not using the 
>> best practices in some areas, because merely typing usually does not 
>> cause problems in most other apps on a fully Windows-Defended
>> system, not to mention Macs. Per common sense and best coding
>> practices, the actions taken by the IDE while we are merely typing
>> and selecting text ideally should not open the doors to get AntiVirus
>> products involved continually. Actions that may get vetted by AV, or
>> that may use greater system resources, need to be considered
>> carefully in terms of approach, timing, and responsiveness.
> I would not be so quick to cast such sweeping judgment on the quality 
> of the work the LiveCode team produces, but the suggestion that the 
> Script Editor is not the cause of Microsoft's issue with Defender does 
> indeed seem reasonable.
> I mentioned the Script Editor as a recipe because its requirements 
> tend to expose issues affecting performance, whether we're discussing 
> those specific to Windows Defender as in this thread, or other 
> specific opportunities for improvement cataloged elsewhere.
> Hopefully this thread may leverage the collective experience of the 
> community to find insight into the underlying triggers for the 
> Defender issue we're discussing here.

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