So here’s a simple analogy.
You are in a hotel and want to order something.
There are other customers too.
There is only one waiter and he is busy taking some order.
Until he finishes taking that order you will not be able to place yours.
Meaning one task has to complete before other comes in.
So everyone is in queue .
But if there are more than one voters then you have a fair chance of giving 
your order as well at the same time.
Also imagine from the waiter’s end,  Until he takes the first order, he is not 
going to listen to you, rather he will not be able to.
So in this case Voice over is in that same situation.
There are quick inputs coming to VoiceOver from several apps, many actions in 
that app and other stuff.
If tasks happen very fast then VoiceOver is able to take the next set of 
commands and process them very quickly.
But a few micro seconds here and there and a lag is obvious.
If this propagates then those micro seconds will build up and at the end vo is 
going to be very very angry and go on a strike (I can’t take these many orders 
at once ).
But if VO works in multiple threaded mode, meaning it can spin two or more 
vaiters at a time (this usually is default case with all apps because they can 
use multiple processors or some other technique ), then it can take in more 
orders and work fast and efficient.
Right now that’s not the case so quick switching of apps and having less 
processing power will make it slow.
Imagine a difference between m1 and m3 as the space between tables for the 
waiter to pass.
If it is narrow then waiter will take more time to reach other tables, add to 
the fact that he is alone.
Now I hope you get it.
Regards.


> On 30 Jun 2025, at 8:54 PM, E.T. <ancient.ali...@icloud.com> wrote:
> 
>    Please explain single threaded. Appreciate it.
> 
> 
> From E.T.'s Keyboard...
> Reality.sys corrupted. Universe halted.  Reboot(Y/N) ?
> 
> My e-Mail:
> ancient.ali...@icloud.com
> 
> On 6/30/2025 8:14 AM, Krishnakant Mane wrote:
>> It is highly possible because M1 is a bit old for this OS.
>> Add to it the fact that VoiceOver is still single threaded.
>> I don’t face this on M3 with 16 gb ram at all, so I guess it’s the 
>> performance lag plus the single threaded nature.
>> Regards.
>> 
>>> On 30 Jun 2025, at 7:47 PM, 'Andrew' via MacVisionaries 
>>> <macvisionaries@googlegroups.com> wrote:
>>> 
>>> Hi,
>>> 
>>> Sincee the latest update to Sequoia 15.5, Voiceover often crashes 
>>> unexpectedly.  I lose speech and I have to restart Voiceover or even 
>>> brutally shut down my macbook air and reboot in order to regain voiceover 
>>> functionality..  Has anybody else experienced this behaviour?  I am not 
>>> sure what causes it but sometimes I have a feeling that if I do something 
>>> quickly on my macbook air like switch from one application to another, or 
>>> open and close a Mail message quickly, this might result in Voiceover crash.
>>> 
>>> Andrew
>>> 
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