Support Class - LMG Proficiency

Dear BF6 Solders,

For Support class, the stats include LMG Proficiency, it says "Faster transition to aim down sights (ADS)", what does it mean? Does it mean faster ADS movement? If yes, suppose my ADS with DRS-IAR is 250 ms, how much faster will the ADS with DRS-IAR improve? Maybe down to 200 ms?