Recently, I have installed Sitecore 8.0.
The problem is slowness. Whenever I reload page(s) in Edit Mode, it is too slow. Below is Console in Development tool in Chrome and most final message is "ApplicationCache is not declared"

It seems like I need to declare ApplicationCache in Sitecore. How can I do??
=== Updated ===
By enabling Application Cache, I could see caching is correctly working. However, after caching loads, SPEAK still calls all SPEAK tool ribbons.
Why????????????? how can I make Sitecore stop loading these???
https://doc.sitecore.net/sitecore_experience_platform/the_editing_tools/improve_the_performance_of_the_experience_editor_ribbon
The web application cache is disabled by default. To enable it:
Add the following string
manifest="/sitecore/shell/client/Sitecore/ExperienceEditor/Html5AppCache.ashx"
to the HTML tag inside the current layout of the item or page, for example, the \Website\sitecore\shell\client\Speak\Layouts\Layouts\SpeakLayout.cshtml base layout file.
Move to "\Website\sitecore\shell\client\Speak\Layouts\Layouts\SpeakLayout.cshtml" then, update like:
<html data-sc-app manifest="/sitecore/shell/client/Sitecore/ExperienceEditor/Html5AppCache.ashx">
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