IJulia is VERY SLOW after loading several packages

[twavv]

Reproduction

This happens on Julia 1.5 (including 1.5.0 on Linux and 1.5.2 on my MacBook). This is not reproducible in the REPL.

This pretty much demonstrates it. All of these cells were run using the "Run All" button, so the delay illustrated in the last cell is not the result of me waiting to execute the cells.

I've uploaded the notebook here: https://my.pcloud.com/publink/show?code=XZpf2pXZvK2tdLxPBw7MM70HtFTNvmJwn2mV

The project and manifest are also included below.

Hypotheses

What seems to be happening is that the first cell execution after the usings block has a HUGE time before it starts actually running the user code. The code in the cell only takes one second, but it's ~200 seconds between the end of the usings cell and the start of the cell after.

I posted about this in Slack. My initial guess was that loading packages was triggering lots of invalidations, but this seems to be taking wayyyyy too long for that to be the case.

Details

version info + project + manifest

Julia Version 1.5.2
Commit 539f3ce943 (2020-09-23 23:17 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin18.7.0)
  CPU: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-9.0.1 (ORCJIT, skylake)
Environment:
  JULIA_PKG_SERVER = https://geo.pkg.julialang.org

Status `/private/var/folders/vy/yhsz3zvx4qb2nz828p201k_40000gn/T/tmp.scghPlVt/Project.toml`
  [336ed68f] CSV v0.7.7
  [a93c6f00] DataFrames v0.21.7
  [587475ba] Flux v0.11.1
  [7073ff75] IJulia v1.21.3
  [c601a237] Interact v0.10.3
  [c8e1da08] IterTools v1.3.0
  [91a5bcdd] Plots v1.6.0
  [37e2e46d] LinearAlgebra
  [10745b16] Statistics

# Project.toml
[deps]
CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
Flux = "587475ba-b771-5e3f-ad9e-33799f191a9c"
IJulia = "7073ff75-c697-5162-941a-fcdaad2a7d2a"
Interact = "c601a237-2ae4-5e1e-952c-7a85b0c7eef1"
IterTools = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"

# Manifest.toml
# This file is machine-generated - editing it directly is not advised

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version = "0.5.0"

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[twavv]

Perhaps even more confusingly, this is NOT an issue if you don't run all the usings at once (eg separating Flux into a separate cell, even if run immediately after the previous usings), it's fine.

[willingc]

I've executed a similar notebook using nteract 0.27, Julia 1.5.3, and IJulia with the following results:

It looks as if the using statements are taking approx 40 seconds to load with 1.5.3.

[nilshg]

This can probably be closed.