Lag in Typing in Yosemite's Mail w/ External Apple Keyboard

Just for the case of it:

I have a late 2012 iMac 21", 8Gb ran, 1 TB disk with USB keyboard, still running Mountain Lion - I have exactly the same problem, which might indicate that any of the last many OS upgrades haven't fixed it - or what?

It's quite annoying, but somehow I have learned to live with it (and use GMail instead).

am wondering if this is a new problem for apple mail users, and not related to the OS? you're on ML, my client is on 10.7... more useful facts? so perhaps narrowed down to Apple Mail/main OS X user account...

I guess so. I must admit I have a notion that the issue was not present when I got the iMac two years ago - but I cannot remember when I first noticed the lagging - sorry. I started with OS X 10.8.2, got updated to 10.8.3 March '13, 10.8.4 June '13, and 10.8.5 September '13. Then ML was obsoleted and I haven't bothered to make upgrades to the system since (it works fine). October '13 I have an supplement to 10.8.5, and I have several security updates since.

I really can kick my self for not noting when this occurred - but anyway I hope this information is useful.

Stumbled over this one (courtesy Korm):

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Apr 5, 2012 2:48 AM Re: Keyboard lag and other keyboard issues
Re: Keyboard lag and other keyboard issuesin response to coldcaption

I've had some success eliminating the keyboard lag by going to System Preferences > Universal Access > Keyboard and toggling the "Slow Keys" option on and off. I always have Slow Keys off, but toggling it seems to cause a reset of the setting.

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Hate to admit it, but for now it seems that this works for me as well. Reply if useful (or not).

i think, when we encounter buggy behavior, we expect it to be momentary...it WILL go away. the important thing is...seems to be a problem across multiple OS's, and seems to be recent. so Mail is the common denominator... where's apple? this needs resolving ASAP.

Agree, It seems that somewhere in the process of adding to much chrome to the exterior, Apple forgot to maintain the engine. One could argue that Apple most likely consider this a minor annoyance and thus will not spend the necessary time to fix it - even if it is across several iterations of their OS.

What is unnerving, is that how many other, and potential more serious issues are not tackled by Apple - but is hidden in the dungeons of support fora?

Apple - please mount the white stallion and enter the scene….

Well that is very interesting, I didnt realise the problem spanned across different os' s - going back to Mavericks has cured both the lag and the backspacing cursor for me 100%. Have been running on my Mavericks ** for more than 3 weeks now and there is absolutely no sign of problems.

I plugged in my Yosemite SSD and ran Mail on it yesterday (needed to make use of Mail Drop to email some large files - that was a total waste of time, would not work, ended up using Dropbox) and the typing lag and backspacing cursor were there, as I expected...

So for me the problems are fixed with going back to Mavericks....

I'm sure I never noticed any text-display lag in Mail until after the Yosemite public release. It was not present in the betas for me, and also not in previous OS versions.

(As to MailDrop, your issue may be that MailDrop calculates when to activate based on the sending ISP, not the receiving one. It would be great if Apple would allow the user to force MailDrop.)

i've never seen the lag until 10.10. but my observation is that it's appeared fairly recently (regardless of OS). does that seem correct?

I think 99% of us here only have had the problem since Yosemite (hence the thread title), it really surprised me to hear of the same problem with Mavericks, but that's very much a minority situation.

Mavericks works 100% for me, that's where I'm staying until the problem is recognized by Apple and a fix is issued. ..

I bet this is iCloud related. It feels to me like Mail is doing something in the background, and I often see incoming and outgoing activity when I see the delay.

In another thread, I just posted an experience that might be related. This has happened twice (that I remember), with both incidents identical:

First, my iPhone 6 went missing from iTunes. Plugging it in with a USB-Lightning cable worked fine, but it dropped off the list as soon as I unplugged it.

Second, my iPhone 6 wasn't updating Reminders. On checking, I found it would not accept my iCloud password. Powering the iPhone down and back up fixed the problem without any further action. In other words, I wasn't logged out of iCloud, the phone just couldn't contact it. Reminders immediately updated after the restart. In addition, as soon as I got home, my iPhone 6 appeared in iTunes.

In both cases, other functions, such as phones, all apps (that I used), LTE, etc. worked fine.

This thread is going around in circles...

it seems impossible to come up with anything that's 100% involved with the problem other than Mail itself.

Maybe it is related to iCloud but for me that does not add up, I am not having any lag problems whatsoever now I have gone back to Mavericks.

Perhaps its a combination of iCloud and Yosemite Mail, there seems to be a number of changes and enhancements to mail in 10.10

Perhaps its a combination of iCloud and Yosemite, there seems to be a number of changes and enhancements to mail in 10.10

Yes. That's exactly what I meant, iCloud + Yosemite (release version). With Handoff, you'd expect Mail to be uploading copies of e-mails in progress as you type, not waiting until after you send.

A couple things:

1. I didn't notice this issue on any machines until Yosemite. No one in my office is having this issue but me and I'm the only one running Yosemite.
2. Mail is usually updated as part of the OS updates is it not? So those experiencing the delay on the pre-Yosemite, what version of Mail is installed? Mine is 8.1 (1993) and I'm running 10.10.1. My instinct is that this is not an issue that predates Yosemite but I can't prove it.
3. I'd caution those experiencing the delay in pre-Yosemite systems to consider the more traditional causes of pausing (disk usage pegging, CPU pegged, memory swapping). Mail in Yosemite is pausing with none of those symptoms for me. I'm about to install MenuMeters to confirm this. I'm getting beach balls during the pauses but the CPU and hard drive are yawning which tells me the Mail threads itself are choking.

   http://www.ragingmenace.com/software/menumeters/

Mail version 6.6 (1510) on ML - problem BTW returned after 30 mins when checking and unchecking slow keys…. so much for that.