The MTU is the 'maximum transmittable unit' of data sent across the ADSL broadband network.

Overall download speed is affected by many factors (see here for more details) and changing the MTU can cause other issues - so if you are getting good download speeds we do not recommend you change this.

However, for some users who are getting slower than expected download performance (due to packet fragmentation) altering the MTU to 1458 bytes may in some cases result in improved download performance.

If you have any other questions please contact us.