Compression in 3.15

I noticed in 3.15 under the wireless tab of a wireless interface there is an option to check or un-check compression. Anyone know what this does?

Also, is there any benefit to using ap and client mode setting for Adaptive Noise Immunity for access points? Does it add benefit especially if you have the CPU to run said setting?

Thanks,

compression (yes | no; default: no) - if enabled on AP (in ap-bridge or bridge mode), it advertizes that it is capable to use hardware data compression. If a client, connected to this AP also supports and is configured to use the hardware data compression, it requests the AP to use compression. This property does not affect clients which do not support compression.

More about advanced-noise immunity is here,
http://wiki.mikrotik.com/wiki/Wireless_FAQ#What_is_adaptive-noise-immunity_setting.3F