Have you tried the Superwave p8?
Yes, also a great synth, but it’s equally as CPU demanding as Lallapallooza. They are both made with the Synthedit tool. Although you can get high quality Synthedit creations, it often comes at a cost of high CPU usage. The thing that annoys me the most about synthedit plugins though, is that their loading routines for some reason is very time consuming. Activating monitoring for one of the Freebees arrangement (and thus loading all insert plugins), can take several seconds depending on your system. Most commercial plugins will load almost instantaneously.