Migrating Large Angular Portals to Standalone + Signals: A Field Report on Bundle Size, DX, and Runtime Latency

Author(s)	Gopi Chand Vegineni
Country	United States
Abstract	Large, multi-module Angular portals often accumulate “framework tax” over time: oversized bundles, sprawling NgModule graphs, brittle RxJS plumbing, and rising build latency. This field report documents a real-world migration of a production, multi-team state portal from NgModules + RxJS-centric state to Angular Standalone APIs + Signals, with SSR/hydration and strict route-level code-splitting. We quantify changes in: build duration, bundle size, server render and hydrate timings, total blocking time (TBT) and an interaction-latency proxy (INP-proxy), along with developer-experience (DX) signals such as code churn and escape-hatch defects. We also capture a concrete migration checklist and the anti-patterns that most harmed performance. Results show 22–38% smaller JS per critical route, 24–31% faster CI build stages, 17–29% lower TBT on mid-range devices, and a 19% drop in post-merge defect rate—while preserving RxJS interop where it adds value (stream composition and I/O). We conclude with pragmatic guidance on when to adopt Standalone + Signals, how to stage the rollout, and where SSR/hydration yields the biggest wins.
Field	Engineering
Published In	Volume 4, Issue 11, November 2023
Published On	2023-11-08
Cite This	Migrating Large Angular Portals to Standalone + Signals: A Field Report on Bundle Size, DX, and Runtime Latency - Gopi Chand Vegineni - IJLRP Volume 4, Issue 11, November 2023.

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