Hi Waldek,

I can not reproduce the slowdown in the following example
after applying your patch.  Did I miss something here?

On 8/24/21 8:48 PM, Waldek Hebisch wrote:
two times longer than current version.  More visible
slowdown is on formal derivatives:

f := operator 'f
D(f(x), x, 655)

currently takes 8.22 sec on my machine.  After kernel patch
it was much longer (I did not wait long enough to know how
much longer).

About the performance in KERNEL, it seems that simply inline
function "height" can give a noticeable boost.

- Qian

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