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

I had the lag even though I have always used the Ariel #14 font.  When I switched on the slow-key, shortest delay, the lag stopped.  I also tested it with replies to e-mails with many nested replies.  Still working.

Sorry...it now appears not to have worked. Really find this problem annoying.

For those who are new to this thread, please remember Apple doesn't (officially) read comments in these discussions.

It really, really helps if they see/hear an outcry from those affected via bug reports or the Feedback channel:

https://www.apple.com/feedback/mail.html

Kirk out

(I just filed a(nother) comment using the link above)

Thanks Kirk for the link. I have just filed a comment about this.

Kirk, thank you.  I also submitted a "bug" report.

Over a week ago, I used Apple's Font Book application to validate all my fonts. Font Book reported two problem fonts, but not Avenir, my Mail font. Still within Font Book, I deleted the two bad fonts and haven't had the Mail typing lag since. I've waited to be sure this solution worked for me before posting but I'm now writing emails with ease as I did before the problem appeared. /e/

I'm glad that worked for you, but I also did the same thing and the lag is still there. I've tried using Cocktail to delete font cache as well and no dice. I think other users have validated their fonts with no improvement. I'm really having a hate on for Apple lately. First with iTunes and now Mail.

I'm new to this thread, but I'm definitely being driven mad by this issue in Yosemite Mail. It doesn't appear to happen in any app, other than Mail.

One thought I had was if it might be related to a Mail plugin that we're all using. I think we should all share which (if any) plugins we're using, and maybe that'll shed some light.

For my part, I'm using two:

Mail Act-On

SpamSieve

I will also go straight to the Mail feedback page and add my complaint to the pile!

Thanks,

John

I use SpamSieve as well. 

no plugins here... (i had mailunreadmenu, but disabled that some time ago...)

I don't use any plugins.  Using the Accessibility Slow-Keys option with the Accessibility Delay set at short continues to work for me.  We have not seen any lag in typing.  My wife is a super fast typist and she has thanked me for "fixing" the problem.

Likewise, I don't use any Mail plugins. I was using Herald but after the last OS update, I never updated it.

Using a 5K Retina iMac 27-inch

3.5 GHz Intel Core i5

16GB Memory

John I. Clark wrote:

 

One thought I had was if it might be related to a Mail plugin that we're all using.

I know that thought was pursued earlier (this thread has become unmanageably long) without any common usage.

One thought I had was if it might be related to a Mail plugin that we're all using. I think we should all share which (if any) plugins we're using, and maybe that'll shed some light.

Good idea, but as others have written, we've been down that road.

Not only do I not have any Mail extensions now, but I never have used any Mail extension, so it's not even possible that some remnants of a past plugin have been inherited as I've updated.

And to reiterate because this thread is so long, if I remember correctly, this only cropped up in the release version of Yosemite. I did not notice it in any of the betas (I used them all).

Font cache or corrupted Fonts?  Corrupted Fonts can be cleared using OSX's Font Book.  Which one did you use?  Or both?