Extremely slow download (8 kbps) and using "show local-host" to troubleshoot

Question

I have a USB device that gets firmware updates from the manufacture, the download of the firmware is very fast at other sites and at home except 1 site.  I found the following difference on the 2 ASAs (one where the download is fast the other where the download is very slow and cannot be completed) using "sh local-host" command. I think the ESP connection is the problem but I am not sure why its there - and I can see the byte count increment very slowly.  What would cause this connection to use ESP?
At the sites where the download is fast
DMZFW#  sh local-host 10.51.40.18 connection
local host: <10.51.40.18>,
    TCP flow count/limit = 1/unlimited
    TCP embryonic count to host = 0
    TCP intercept watermark = unlimited
    UDP flow count/limit = 0/unlimited
  Conn:
    TCP Outside 70.42.140.65:80 inside 10.51.40.18:54632, idle 0:00:00, bytes 19480442, flags UIO
... ... (repeat the above command)
  Conn:
    TCP Outside 70.42.140.65:80 inside 10.51.40.18:54632, idle 0:00:00, bytes 24182974, flags UIO
At the site where the download is extremely slow (like 8 kbps)
DMZFW# sh local-host 10.1.40.74 connection
local host: <10.1.40.74>,
    TCP flow count/limit = 1/unlimited
    TCP embryonic count to host = 0
    TCP intercept watermark = unlimited
    UDP flow count/limit = 0/unlimited
  Xlate:
    PAT Global X.X.X.X(30020) Local 10.1.40.74(50582) 
  Conn:
    ESP outside 70.42.140.65 inside 10.1.40.74, idle 0:02:48, bytes 0
    TCP outside 70.42.140.65:80 inside 10.1.40.74:50582, idle 0:00:00, bytes 2308822, flags UIO
... ... (repeat the above command)
  Conn:
    ESP outside 70.42.140.65 inside 10.1.40.74, idle 0:02:51, bytes 0
    TCP outside 70.42.140.65:80 inside 10.1.40.74:50582, idle 0:00:00, bytes 2318474, flags UIO

Answer 1

I managed to run the test again a few minutes ago, was a bit quicker this time
Test1 comprises of two tests 1.
Best Effort Test: -provides background information.
Download Speed 7 Kbps 0 Kbps 2000 Kbps
Max Achievable Speed Download speedachieved during the test was - 7 Kbps For your connection, the acceptable range of speeds is 800-2000 Kbps.
Additional Information: Your DSL Connection Rate :2167 Kbps(DOWN-STREAM), 955 Kbps(UP-STREAM) IP Profile for your line is - 1911 Kbps
2. Upstream Test: -provides background information. Upload Speed 588 Kbps 0 Kbps 955 Kbps Max Achievable Speed >Upload speed achieved during the test was - 588 Kbps Additional Information: Upstream Rate IP profile on your line is - 955 Kbps This test was not conclusive and further testing is required.This might be useful for your ISP to investigate the fault.