[jnpnj]

https://series.sourceforge.net/ this is the SERIES package you're referring to ? sorry, mostly a CL newb here, it's the first time I read about it

[jwr]

Yes, this is the one I wrote about. I used it quite a bit a long time ago to get more performance. I remember vaguely that the performance was indeed there, but the package wasn't that easy to use and errors were hard to debug.