Compare performance of Bootstrap 4 and 5 grid

Setup

• ~2000 lines of HTML each
• "easy" DOM: h1, a .row and 3 .col, many ul + li nodes with random data
• Show results using PerformanceNavigationTiming interface "domInteractive" property

• current Bootstrap 4.3.1 grid
• latest Bootstrap 5 grid (https://github.com/twbs/bootstrap/pull/28517)

Measurement results

10 runs for each grid, tested locally, Chrome 79

v4

• 51
• 52
• 52
• 53
• 54
• 51
• 52
• 54
• 51
• 52

Median: 52.2ms

v5

• 51
• 51
• 51
• 49
• 55
• 53
• 52
• 54
• 51
• 50

Median: 51.7ms