[isabelle-dev] Performance of "class" command

[Florian Haftmann]

Hi Brian,

> Sometimes the "class" command can be rather slow, for example:

> I don't know what the "class" command is doing behind the scenes, but is
> it supposed to be taking this long? Should this be considered a
> performance bug?

Without a closer look at this I would deem that this is due to the
corresponding locale context which has to be built up twice (or even
three times), issuing every declaration inside.  A similar delay can be
experiences e.g. by writing

context ordered_field
begin

So far I did not attempt to reduce this delay, but perhaps it is possible.

	Florian

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