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streams: Optimize stream_data.create_sub_from_server_data. 

This is definitely a micro-optimization, but avoiding
creating an extra object speeds up page loads by about
20ms per 1000 streams.

It's slightly sketchy to mutate the value in place, but
the original value never gets used again.
This commit is contained in:
Steve Howell 2018-11-29 20:50:20 +00:00 committed by Tim Abbott
parent 6781345b9b
commit d8c8fc1f03
1 changed files with 9 additions and 4 deletions
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13
static/js/stream_data.js
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@ -443,11 +443,16 @@ exports.create_sub_from_server_data = function (stream_name, attrs) {
// Our internal data structure for subscriptions is mostly plain dictionaries,
// so we just reuse the attrs that are passed in to us, but we encapsulate how
// we handle subscribers.
var subscriber_user_ids = attrs.subscribers;
var raw_attrs = _.omit(attrs, 'subscribers');
// we handle subscribers. We defensively remove the `subscribers` field from
// the original `attrs` object, which will get thrown away. (We used to make
// a copy of the object with `_.omit(attrs, 'subscribers')`, but `_.omit` is
// slow enough to show up in timings when you have 1000s of streams.
sub = _.defaults(raw_attrs, {
var subscriber_user_ids = attrs.subscribers;
delete attrs.subscribers;
sub = _.defaults(attrs, {
name: stream_name,
render_subscribers: !page_params.realm_is_zephyr_mirror_realm || attrs.invite_only === true,
subscribed: true,