105mb is not so normal. But it dependent on websites you are visiting. It caches your visited web for quite BACK and FORWARD without reloading. currently you can store up to 24 webpages for each tab. So if you have lots of graphics intensive websites, it is very possible. Version 6 is really geared toward higher end phones, which usually have a chunk of memory available for use. Please note that the cached the content will not consume any CPU power and no negative impact on battery (reloading does actually).