Default [Q] LTE RAM Dump?

On my rooted I747 on AT&T, If I dial *#*#4636#*#* I get the option to toggle LTE RAM Dump. Doing four speed tests, two with LTE RAM Dump on, and two with it off. Results are:
LTE RAM Dump Off:
#1
Ping: 102 ms
Download: 14.98 Mbps
Upload: 3.22 Mbps
#2
Ping: 96 ms
Download: 12.06 Mbps
Upload: 2.40 Mbps

LTE RAM Dump On:
#1
Ping: 89 ms
Download: 12.99 Mbps
Upload: 2.75 Mbps

#2
Ping: 98 ms
Download: 16.98 Mbps
Upload: 2.64 Mbps

Any idea what it's for?
MODEL:Galaxy S III
VERSION: SGH-I747
RECOVERY:Stock
ANDROID:4.3
ROM/BUILD:JSS15J.I747UCUEMJB (Rooted)
KERNEL:KERNEL:3.0.31-2024954 (Stock)