Need help with reducing map size

[MesiahSephiroth]

alright... I need help with reducing the file size of my map... currently its at 4.75 megabytes I've ALREADY used vexorians map optimization and widgetizer as i find they have the best results... aside from the obvious (deleting things and what not) how can i reduce map sizes perhaps another tool that goes well with the other 2 i stated or what...because i noticed a lot of other maps...which aren't as big dimensions wise and have more models and stuff and yet somehow are still smaller...this really baffles me...please any sure fire way of shrinking the map size any tips/help is much appreciated

 

[HappyTauren]

DONT use widgetizer tif youre gonna reduce map size, it enlarges it

 

[Mini-Me]

Reduce the quality of the skins.