The loading speed of your site can be determined by a number of things: Web host, plugins, image compression, code changes, and more.
Here are a few articles to check out on the topic of WordPress speed.
- 15 Easy Ways To Speed Up WordPress
- How To Speed Up WordPress
- Speeding up WordPress
- 5 Quick Ways to Speed Up Your WordPress Site
If you plan on using a cache plugin, please check out this post on cache plugin problems to find the best settings for you.