Google has hinted that if you want to make your website rank in the top then you need to make sure that its loading time is reduced. This is because Google wants to make sure that all the websites listed on the Search Result Pages would load real quick, hence here is a Online Tool offered by a company which offers website monitoring service and which can be tried here. The tool would need you to Enter any website or webpage URL in order to get started after which it would load it completely and give you the stats. You can even try out the Google Page Speed Tool which works similarly giving you some suggestions on how to reduce the load time.
1. Hosting all your advertisements on the same server IP or else on a single server to make sure that whenever your website loads all the ads would quickly loading and the server would not have to connect to multiple resources and increase the loading time.
2. Compress the Images like GIF or JPEG and make sure that you dont reduce the quality but just the size because thats what that matters in website loading. If you can retain the same quality then there is no issue in compressing the Images.
3. Fix CSS Files and try to remove the useless CSS Codes which are not going to be used. This means that if you are having a lot of CSS Codes for some functions which arent being implemented then you should remove them and reduce the overall size.
4. Enable Gzip Compression using different pluins or using modules on your server itself because this can make sure that the output of the files are reduced and would load quicker.