I find that output into iESS goes much faster if I disable font-lock-mode.

And if you don't need the complete transcript, you can turn on buffer
truncation. This will largely prevent Emacs from having to recopy the
buffer to larger and larger arrays.

(add-to-list 'comint-output-filter-functions 'comint-truncate-buffer)



On Mon, Sep 16, 2013 at 2:42 PM, Rodney Sparapani <rsparapa@mcw.edu> wrote:

> On 09/13/2013 04:39 PM, Vitalie Spinu wrote:
>
>> As I said before, the reason is eldoc [more precisely the inability of
>> ESS to reliably detect when R process is busy]. And it was there in
>> 12.04+. I will solve it some day, but for now C-g should work whenever
>> that happened. There is no reason to get nervous about it.
>>
>>     Vitalie
>>
>
> Hi Vitalie:
>
> Maybe this is related then.  When I generate a large amount of
> output in an *R* buffer, it goes very slowly, i.e. several minutes
> compared to a few seconds in batch.  Of course, here C-g is of no
> help, but it maybe this is related to my comint setup.
>
> Rodney
>
>
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