Shrinking Elephants: Managing large projects with Gradle

Dev laptops scream as Block puts its mega‑project on a diet

TLDR: Block says syncing its giant codebase took 24 minutes and 36GB, so they cut it to 15 seconds by only loading what developers need. Comments exploded into monorepo vs split, Gradle vs Bazel, and “just use Vim,” but most agreed: less bloat, faster work, happier humans.

Block’s engineering blog just dropped a jaw‑dropper: their mega codebase—a beast with 5 million lines spread across 2,000 projects—made IntelliJ (a popular coding app) take 24 minutes and chew 36GB of memory just to open. Cue the community clutching pearls and cracking jokes. Their fix? Don’t load the whole zoo—load only the enclosure you need—bringing sync down to 15 seconds and 3.5GB. Developers erupted. One camp cheered the pragmatism: “Finally, don’t make my laptop beg for mercy.” Another camp rolled their eyes: if your editor needs a gaming PC, the architecture is the problem. The monorepo crowd sparred with the split‑repo squad, and the “use Bazel/Pants” brigade marched in, declaring Gradle (a build tool) the villain. JetBrains fans defended the IDE (“smart tools need data!”), while minimalists showed up with memes and Vim evangelism: “Opens in 0.1s, knows nothing, breaks nothing.” There were spicy doubts too: are you just hiding modules until CI (the robot that checks code) screams? Others applauded the user‑first focus: edit faster, ship faster. The vibes? Peak drama, peak humor, and a surprisingly practical takeaway: you don’t need to carry the whole elephant—just the parts you’re actually feeding.

Key Points

  • A large Kotlin backend repo (~5 million lines across >2,000 Gradle projects) has heavy IDE sync costs.
  • A no‑op sync averaged 8.4 minutes using 24 GiB Gradle heap plus 12 GiB IDE heap (36 GiB total).
  • A cold sync after dependency updates took 24.7 minutes, downloading ~26,000 files totaling ~4 GiB.
  • IDE sync uses IntelliJ-injected Gradle model builders via the Tooling API; configure-on-demand does not apply.
  • Targeted developer experience achieves ~15-second syncs using ~3.5 GiB heap (97% time, 75% memory improvement).

Hottest takes

“If your editor eats 36GB to open a folder, your design ate glue” — @microrepo_monk
“Bazel, Pants, Heck—anything but Gradle for whales” — @cache_me_outside
“Solved it: Vim opens in 0.1s and knows nothing” — @ancient_wizard
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