[LRUG] Fwd: Recommendations for Ruby & Rails optimisation resources

[Jonathan del Strother]

On 26 November 2012 15:36, Jonathon Horsman <jonathon at arctickiwi.com> wrote:

>  Are you rendering a lot of partials?  There's quite a bit of overhead
>> in setting up each partial, it can sometimes be worth flattening them
>> out.
>>
>
> This is an interesting one, I thought this too but timing before and after
> flattening shows that rendering partials is actually faster.
>
> So I have
>
> *= render :partial => "share", :collection => @shares*
>
> renders about 500ms faster than this:
>
> *- @shares.each do |share|*
> * <!-- inline row HAML ->*
>

Yep, using "render :collection" isn't actually too bad, since (IIRC) Rails
can prepare the partial once & reuse it.  If you were to swap it for the
apparently identical -

- @shares.each do |share|
   = render :partial=>"share", :object=>share

- then Rails does have to recompile each time, which can be pretty slow.
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