No unnecessarily large packages where lighter alternatives exist

Bundle size directly affects Time to Interactive, Core Web Vitals scores, and user-perceived performance — all of which influence both conversion rates and Google search ranking. A 67KB gzipped moment import on a page that formats one date adds payload weight that could instead be eliminated by a two-line switch to dayjs. Beyond performance, heavy packages often bundle more code than you use, increasing the attack surface of your client-side JavaScript: a compromise of the package affects all the functionality bundled in, not just the features you call. The ISO 25010 performance-efficiency characteristic explicitly covers minimizing resource consumption relative to functional requirements.

Replace known heavy packages with lighter equivalents. Moment to Day.js:

npm uninstall moment
npm install dayjs

// before
import moment from 'moment'
moment().format('YYYY-MM-DD')
// after
import dayjs from 'dayjs'
dayjs().format('YYYY-MM-DD')

For lodash, switch to per-function imports instead of the full library:

// before — imports entire 71KB lodash
import _ from 'lodash'
_.debounce(fn, 300)
// after — imports only debounce
import debounce from 'lodash/debounce'
debounce(fn, 300)