Phase disperser CPU efficiency in gen~

Total noob at filter design here, but I wanted to take a crack at building a phase disperser using allpass filters. This design is based on a YouTube video where the creator used Ableton's Phaser-Flanger stock device to do the same thing, and I just really liked the sound it had. I tried other methods of dispersion in Max but couldn't get that sound until I pulled up the gen~ biquad example and chained them together. This gets very close to the sound in the Ableton method.

The downside is that it's currently eating up over 60% of my CPU, which is a no-go for running this effect inside some of my other intensive patches (and it's not even as deep as Ableton's, which can run up to 42 stages, whereas this is only at 16 currently). Just coming here to ask if there's anything I can do to make this effect less costly, or if there's another way I might build it which gives the same sound.