Lightmapping Increases my game size

Hi,everybody in my game i discovered that my two directional lights made the game lag alot so i decided to bake the scene.After baking my game size is now 761mb which is enormous compared to the 75mb it was before.Please help me with this

Lightmapping takes all the light informations and bake them into textures.

If the atlas textures sizes are large,your scene is large and you have dual light maps enabled it is something normal to have the game size increased, however in your case it is a bit much…

Reduce the resolution:

Lightmapping > Bake > Resolution > [ ]

Single Light Map:

Lightmapping > Bake > Mode > Single