Browsing Data... As i checked my phone i found out that my browsing cache is extremely full Another reason why my phone running slow in uploading/downloading.. I also cleared/deleted all my apps cache and put hibernate to those seldom used apps.. It also require system update to get it back up to speed.. Some of the Few steps on how to fixed issue on your phone lags, runs very slowly, takes longer time to responds Or try to Restart your phone if the issue is not fixed..