There are many reasons such as slow internet, too many extensions, antivirus or firewalls etc. that can be the causes of slow loading of Facebook . However here i am going to talk about some easy ways that you can try to solve your "Facebook loading slow" issues.
1. Check your internet connection
2. Clear all the cache and cookie
3. Check if Facebook is down
4. Disable all plugins on you browser
5. Restart your Facebook app