PHILADELPHIA (CBS) – Ever feel like the internet is getting slower?

According to data tracked by HTTP Archive, the average time to download a website has increased.

READ MORE: Mayor Jim Kenney Hopes President Biden's Infrastructure Deal Could Help Job Training Programs In Philadelphia

Experts say that’s because the average size of a website is nearly double what it was three years ago.

READ MORE: 'Survivor' Contestant Michelle Yi Describes Frightening Santa Monica Assault

Videos, pictures, embedded tracking tools and increased website security also contribute to slower speeds.

MORE NEWS: New Jersey Officials Show Off Thousands Of Guns In Largest Single-Day Gun Buyback Ever

Online traffic is also up, thanks to mobile devices such as tablets.