the tabs are seperated in importance,

the first one (errors) should be solved ALWAYS, the second is an alert, it could well be that you don't want to solve it, that's no problem. The third is just information that you should pay attention to but it is not a big issue. ( I sometime have alerts and choose not to solve them, if you now why then the website will still run...)

If it is a size issue you good do yourself an extra check for instance if you have a slow internet connection and /or a  handheld check if the site is stiil good under these conditions. If it is I would not worry about it. It's just an information, i would think carefully about making it even bigger though, but if you wish it your choice, there is no limit. Just keep in mind how your users see your site.