I have definitely experienced this failure to start the "up" portion of the speedtest.net test. I have to kill the app altogether to get out.
I received my replacement iphone 5 last night (VZW), and have been testing connections from home. On my previous phone, I was getting roughly a -94 dBM 3-4 bar LTE, with approx. 12-16 Mbps down, and about 7 Mbps up -- on average. Now? SO FAR.. Still about -94 dBM 3-4 bar, but I do see an improvement where 14 Mbps is on the low end, and I have been able to pull down low 20 Mbps somewhat consistently now (w/ 24.8 highest). Also, my Wifi seems to be drastically improved. Previously I was only pulling down 12 Mbps and now can consistently pull down 18 Mbps +. No other change to my wifi network.
These are very early tests, within a descent LTE area. My new phone has only been online for 12 hours, with only 4 hours of use/testing. I will continue playing around to try and rule out other factors and see what happens.
The real test will be at work on monday where I have a weak LTE signal (1-3 bars, 100+ dBM, under 5 Mbps down), with flapping between LTE, 3G, "o". I have also seen the indicator stick on LTE or 3G while pullilng no data at all, and then not easily switching to a strong network when I move into a better coverage area. stay tuned.....I will be surprised if this new phone performs well on monday, but we'll see.....