@ Kaeporo, has anyone tested a speed cast upgraded wand or INT magic wand ego for their faster casting + the updates magic weapon mastery casting speed? I asked about it a page or so ago but no one ever replied saying they would test it or what not. (Unless I'm blinder than a bat.)
No one's gonna test ego speed reduction because no one has 10m+ in test server or the time to feed one just to test. Even if it's a test server, most of the limitations of being a newbie in a live server also apply.
Speed cast wand also takes money to buy and upgrade, and that much money can take a while to obtain because you depend on fomor scrolls or shadow missions to make tiny bits of cash and can barely fight in them because of 3k+ ping.
In other words, be patient. If someone is interested enough in your question to test, they will, but it takes time if gold or accessibility is an issue.
If what Kaeporo is saying is correct if compounded properly, charging skills like fireball stacked with phoenix fire wand upgrades, 1500 int, weapon magic mastery, and maybe a vivace can be cast very quickly.
Did you misread Kaeporo's post? He means the opposite. That none of those (besides maybe magic weapon mastery as it is untested) compound or stack at all.