|Is it the website that is taking a while to load at certain times of the week? Or is it the browser itself? |
If it is the browser, you may scheduled processes that run at certain intervals (ie., virus and spyware scans, computer restore points...)
If it's the website that is taking too long to load, then it could be your ISP. There are certain times of the day when accessing the internet may take longer due to more people around you signing on. Times include lunch, after school and after work.
Some ISPs will have internet hubs where they may have multiple houses and/or business operating on. Unfortunately, if this is the case, there really isn't anything you can do about it.