It's all good here; downloaded Speedtest by Ookla 19mb in less than 30 seconds Selangor region 20th August 3.13am

I found something might solve this. I this it's related to the DNS and the wifi connection. I change the DNS on my phone to the one I bought to watch Netflix, I noticed the download is faster. And so happened that I tried the download near to my router, the phone next to the router, then BOOM. All download/update finish within 10 minutes.
I try to change the DNS to auto as per router IP. The download stuck again, switch back to the purchased DNS IP, it working again. But the download slowing down when I back to my room, the router is in opposite room. I tried to test the download again near to router then download resume rocket speed.
This is really weirdo. But at least I found the way to resume high speed download although it's not convenient.

Updating app is blazing fast.... I am using google dns now

No difference on my end. Google DNS, OpenDNS, all mixture of both.... no difference whether on phone or router.

For most people complaining on this thread, it's not the iOS updates that are slow. Only updates and downloads from the App Store, iTunes and iBooks are suffering. OS updates are still fast.
Thank you. I'll try connecting/disconnecting to see if I can land on that range.  Tomorrow must go buy Toto already.

Share if you want. I got nothing to hide. I don't see how it'll speed things up though. There's people complaining on Facebook, Twitter, 100 and still no response.

What I'm surprised is that not enough people are complaining.  Guess it just goes to show that the majority of people don't use anything more than the stock apps included on the phone, and maybe download an additional Facebook and IM app. 

Seriously, I can't update shit right now. When you require apps like Slack for team communications in your company and can't update the app, you lose productivity and are susceptible to security issues. Will TM reimburse me for lost income or a breach in my privacy?

i noticed that if use vpn on phone apps download fast , so is not wifi or router problem, tm throttled speed?

Something I've noticed for the last 4 or 5 days on both my Singapore ISP and TM UniFi;
When the update starts downloading and it crawls very very slowly, stop the update and start again. Usually the second or third time I restart, it'll fly like normal. Weird, but that’s what's been happening for me.

For me, appstore downloads not affected, but restoring from iCloud takes ages, also couldn't turn on iCloud music library. Could only do it early morning 6am+.

Yup, the problem is back.