Hi,

I just noticed (when testing a link to sagemath.org from my webpage) the
single Cell Server:

http://sagemath.org/eval.html

so I played with it a little bit and I think this is really cool.

Here is some feedback:

* There should be more examples with interact (I would create a topic
"interact")

* It is not easy to tell whether the server is computing (I tried
sympy and it freezed, so I thought that
something broke, but it was just calculating for about 5 or 10s). For
interact, there
is a blue line, so I know that it is computing.

* the blue line for interact (the server is computing) is not very
intuitive for me, it took me a while to realize
that this is what it means

* sometimes it seems slow, i.e. this script:

from sympy import var
var("x")
print x-x
print x**2

takes 5 seconds to evaluate. If you try the same thing here:
http://live.sympy.org/,
it is immediate.

* the interact could update immediately when dragging the spinner --
assuming the round trip
can be brought to around 1s.

* I tried many of the examples from here:
http://wiki.sagemath.org/interact (I know
I can use the Sage notebook, but I always forget the password and so on, this
cell server is much better for experimenting)

* sometimes the blue line seems to stay on, try for example
http://wiki.sagemath.org/interact/diffeq#Euler.27s_Method_in_one_variable


What is the current bottleneck in terms of the round trip? Is it
possible to make the interactive examples faster?


Anyway, thanks for doing this. I think this has a huge potential.

Ondrej

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