I have the EXACT same issue with my Iphone 4 in and around Atlanta. I just switched from a Droid X and average speed using that phone on the Speedtest was 700K to 1.5 megs, depending on time of day. Since moving to the Iphone, I've NEVER seen anything HIGHER than 500K on 3G, which is pathetic.

iPhone 4 - Technical Specifications Feb 19, 2014 ‎Speedometer Speed Box on the App Store The best speed app on iphone” 5 Stars by kurtonic Speed Box is a Speedometer and GPS app for both your iPhone and iPad. It displays your current speed, distance, direction and altitude along with your top speed and average speed. The app also keeps a record of the speed and altitude for the last few hours. iOS 12.4.8 Battery Life Drain & Speed On iPhone 5s / 6 iOS 12.4.8 Battery Life Drain & Speed On iPhone 5s / 6 Compared On Video By Oliver Haslam | July 21st, 2020 Apple released iOS 13.6 to the public recently but alongside that we also saw the arrival of iOS 12.4… 8 ways to speed up your old, tired iPhone - CNET

Aug 26, 2015

We built A13 Bionic to deliver unparalleled speed and advanced machine learning. It’s what allows iPhone 11 to power through processor‑intensive tasks. Shooting 4K video at 60 fps in extended dynamic range, for instance, is like a firehose of information hitting the video encoder at once. Processing it would be a challenge for most chips. 9 Tips To Boost IPhone Internet Speed - Whatvwant

Aug 26, 2015

It's easy to speed up a video on your iPhone – or return a Slo-Mo video to normal speed – using the iMovie or Photos apps, respectively. Here's how. 8 ways to speed up your old, tired iPhone. Apple is slowing down older iPhones to conserve battery life. Use these tips to boost your phone's performance. Matt Elliott. Dec. 21, 2017 10:32 a.m. PT.