Does my iPhone 5s have a virus or bug?

I've had this phone for a few weeks now. I luv it. Never had a problem with speed or anything. I've been watching videos a lot recently on safari. Music videos, etc… Now the phone doesn't seem as fast as it was. Mainly my issue is on Instagram. Whenever I use to open the app the pictures would come up instantly. I could watch a video without having too wait. Now whenever I open it and it refreshes the photos do not come up right away, and the videos take a LONG time to play and sometimes they don't play all the way thru.Am I trippin or is this a virus or bug on my phone causing it too run slower than normal? Everything seems to be a little bit behind.

Everythings good sometimes you have to delete things such as pictures or clear your browsing history. Also you can restore it to a backed up file and restart it. But everything should be okay and maybe its the Wi-Fi or 4g