All text of the "blazing fast" animation comes at once
Text to come one by one

I was trying this in Safari
@Haroenv I can't replicate this! What version of Safari/Mac OS/etc?
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I was using the tech preview Release 63 (Safari 12.1, WebKit 13607.1.2.1) (maybe the issue is just there?). I have the web animations feature enabled, are you using that?

Definitely an issue with Safari Tech. Preview. Able to replicate as soon as I switched to it!
I'm not sure there's a _ton_ of value tracing this down, because it's very possible it's some bug in Safari and will be ironed out in a future release.
For what it's worth, here's the animation source
(it's just CSS!)
perfect, will file an issue there instead
Let us know! Thanks for the bug report, we appreciate it!
it's rdar://44151416 (their bugs are internal), and I confirm it goes away when I remove "web animations & css integration". I didn't initially realise it would be connected
@Haroenv Thanks for filing this issue. For future reference, you can also use bugs.webkit.org to file rendering bugs in Safari Technology Preview like this one. I reduced the issue and filed Bug 189411 - [Web Animations] Positive delays of accelerated animations are not respected.
Thanks for verifying and reducing this test case, I'll use the bugzilla in the future, always a bit confused where to file things for Safari
Most helpful comment
@Haroenv Thanks for filing this issue. For future reference, you can also use bugs.webkit.org to file rendering bugs in Safari Technology Preview like this one. I reduced the issue and filed Bug 189411 - [Web Animations] Positive delays of accelerated animations are not respected.