ispac SSIS中的文件大小越来越大

I am using SSIS version 2012 , and in that I am using ispac file for deploying my SSIS packages (the packages are added dynamically to this file), and the size of ispac file is increasing after each run , that is making execution of SSIS package very slow . (e.g. loading it to Database (CSV to DB) takes 3 mins. (with ispac file size 2 mb) and same loading (same csv to Database) takes 21 mins (with ispac file size 5 mb) )I am using SSIS version 2012 , and in that I am