Photoshop Script: Export Layer To File

The "Export Layer To Files"  script seems to be a plugin script therefore it records the setting use in it dialog into an action step when recorded into an action. Thus when the action is played the "Export Layer To Files" script step  will bypass displaying its "Export Layer To Files" dialog and use the setting it recorded into your action step. So you must have selected save jpeg and set a high quality jpeg setting in its dialog when you recorded the action. If you re-record the action step and uncheck include ICC profile and set a low jpeg quality setting.  The jpeg files saved will be smaller in the future.   The Jpeg quality setting influences how  compression is done.  Low quality setting loose more image quality than high settings but the output file size is smaller with lower values. Save for web you can reduce output size also by saving lower quality image additionally you can also strip all image meta-data and reduce the  image size using interpolation.