Data loads seem much slower with Net Fetch

[philrz]

tl;dr

Unfortunately, we failed to notice before the merge of #3069 that those changes there are making data loads much slower For instance, a load that previously took 5 seconds on my Intel Macbook now takes 3+ minutes.

Details

Repro is with Zui commit cc740ad.

The first video shows how things were performing better at commit 64f50eb right before the changes in #3069 merged. Here I'm doing a Quick Load of the ZNG-format zed-sample-data. As it shows, the data load takes about 5 seconds.

64f50eb.mp4

The second video is at commit cc740ad which is associated with the changes in #3069 that has the app using Net Fetch. As it shows, the same data load is now taking 3+ minutes.

cc740ad.mp4

[philrz]

Verified in Zui commit 508a6ae.

Verify.mp4

As shown in the attached video, the same data load now once again takes under 5 seconds to complete on my Macbook.

Thanks @jameskerr!