Hi all, I believe some of us we've working alongside Check Point for quite long also have the same complaints, at least for the SmartConsole performance and, a very critical one, the HTTPS inspection feature.
I think CP must work hard on solve the multiple issues regarding for HTTPS, as almost all blades need the HTTPS inspection be enabled to meet its full potential. It's disheartening for me to can't analyze all the internet outgoing traffic (and miss the full level of details of the views/reports) because if I enable the HTTPS inspection I've my bosses kicking on my office because internet browsing is almost unusable.
Also, I've the same performance issues with SmartConsole, no matter how much resources I apply for the VM running the management or how resourceful is my desktop computer. The delays when applying changes to gateways or the full screen almost freeze when publish the changes are issues that now I'm used to it, but it deal a lot of damage of the user experience, as Aner pointed out in the OP.
Finally, the AD integration for SmartConsole administrators it's kind of tricky to deploy, as you says it need a Radius server to manage the authentication request. But, as Dameon pointed out, it doesn't have any issues for the functionality standpoint.
Hope CP, the R&D dept. and all the guys are working on this issues take our criticisms as constructives ones.
Regards!