At my house there’s a pretty standard eight second lag for an IFTTT request. That’s acceptable to me, but I know it’s longer than a lot of people would like.
There are a couple of other method you can try if you want something faster.
I’m not sure how long the official ST/harmony integration takes now, hopefully someone else will answer.
The Yonomi/harmony integration is noticeably faster than IFTTT at the present time. There are quite a few people using that. It’s just a software app, so no additional cost. It doesn’t integrate with smart things, but it does with both echo and harmony.
If you’re willing to set up your own server, you can use askAlexa.
Personally, I’m waiting to see what the official echo/harmony integration does once it comes out of beta. ( it’s being developed by harmony itself.) I have hopes that this will be the fastest available once it’s released. But we’ll have to wait and see. 