But it is commonly practice regarding slow speed while we are update applications or surfing the web. Probably internet connection may be disturbed by several causes. Android Phone network selection is the big reason, weak signals is also 2nd more important reason.
But when I have use some small tips I observed about changing in inter speed. Not more considerable, but not so bad.
Always select right and good operator
Perhaps it is not so normal. You must be know enough information about service provider and its network whether it is strong or weak.
Install Internet Booster Applications
By the help of some applications like Internet Booster or Internet Speedup you can get some help for your phone not more considerable but something is better then nothing.
Always select right and strong browser
It is general perception that good browser is most important for net surfers. Because generally every browser having different styles of working. My proposal is in favor of Opera Mini, the compression technology use in this browser is very important for content compression. as a result surfing is going to fast.
Clear your phone Cache
More Cache store in your phone is also big reason for slow internet. Delete files daily bases from your phone cache.