I personally would recommend going ahead with the 3.4.7 conversion, it's solid and works well, then a simple upgrade to 4 once it's final and solid. As with the IPS4 betas, there will be bugs to work out in the converter app as well, so I would get it done now and not worry about it myself.
I normally don't use any testing sites from third parties, I can tell what sites are doing from the back end and what is quick or not etc, I go by real usage of the site, some people love test site results though, and why I posted these.
Those test were done using nginx as a reverse proxy for apache 2.4, php 5.6 with Zend opcache, and mariadb 5.5. I also did the same test using the same configs without nginx and just apache 2.4, there wasn't enough of a difference to matter with normal loads, however under stress testing while also running the performance test at the same time, nginx performed better. Here was the results during the stress test of 200 request per second while also running the performance test. (please note these performance testing sites are not 100% accurate, however it's a decent guide to go by for testing if you use them all and combine the results with some common sense.)
Here is a test of ips4 beta5 vs 347, same server, same setup, same fresh install for both versions. (apples to apples) I didn't post all of the prior testing, I just wanted to show the great results of beta6
I have been testing IPS4 along the way for speed, using many different configurations, and wanted to share the end results with Beta 6 tonight. Of course this is a clean install, however the numbers are very promising.
I would recommend that you purchae and convert now, then when IPS4 is released as the final version you can upgrade at that time. I would not recommend running beta software on a live production site though.
In testing, so far with ips4, I'm referring to the licensed url and the url the board is setup to run under, ssl for logins would not be effected though. For example if I install under https, then later change to http, the license may not work properly as the full license url is matched currently. Re-installing the software in my case for many many test setups has triggered this, so if it matches perfectly, all is well.
If you have any trouble doing so, you can let us know by submitting a support ticket once 4.0 is released as final. Currently the ulr must match exactly is what I was noting, so if you are having trouble with your license, and you think it may be due to the licensed url being http and you are using https, please file a ticket and we can adjust this for you if needed.
With our new license changes, it must match exactly, so if it's https via http, it would make a difference in my testing with IPS4..specifically for a re-install etc. If this is the case for anyone, please file a ticket and we can adjust the url for you without having to reset the url etc since it's not actually a url change.
Rhett you are the best you have helped me out so much Thanks for trying to help with my issue's i have had if there was a feedback system for each staff member if there was a 1 out of 10 i would pick 10 because you are the best thank you