[Logging] Expanding/collapsing a logged object feels a little slow

[lostintangent]

Update: I noticed that this perf issue seems to be related to requests with lots of logs, so the virtualization work for the list that Mike mentioned in another bug would likely improve it.

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Repro steps:

1. Open up this URL
2. Launch the corresponding Glimpse client
3. Select the request which corresponds to the /create route
4. Expand/collapse one of the logged objects in the list

Expected: For the expand/collapse action to "feel" fluid/instant-ish Actual: It seems to take about a second to perform this action, which definitely feels a little slow, and begins to be a bit painful when navigating a deep object.

[avanderhoorn]

There are several perf issues that we know about once you start getting into scenarios that have large amounts of log statement. We believe we know what needs to be done to improve this greatly, just a matter of scheduling the work.