WIP: Fix slow fetch delegations

[fedekunze]

Fixes #2009

---

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Updated all relevant documentation (docs/)
• Updated all relevant code comments
• Wrote tests
• Added entries in PENDING.md that include links to the relevant issue or PR that most accurately describes the change.
• Updated cmd/gaia and examples/

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #2078 into develop will increase coverage by 0.12%.
The diff coverage is 75.36%.

@@             Coverage Diff             @@
##           develop    #2078      +/-   ##
===========================================
+ Coverage    63.91%   64.03%   +0.12%     
===========================================
  Files          134      134              
  Lines         8194     8222      +28     
===========================================
+ Hits          5237     5265      +28     
  Misses        2604     2604              
  Partials       353      353

[fedekunze]

Moved to #2139