Oracle Visual Builder: Applications That Outlive Their First Release · Module 15 · Performance
Rendering a large list
Lesson 151 of 176 · 3 min
What the browser does with TWO THOUSAND ROWS, and THE COMPONENTS THAT HANDLE IT FOR YOU IF YOU LET THEM. This is the slowness that is not the network. The data arrived quickly and the page still takes seconds, because the browser is being asked to build something enormous. EACH ROW IS REAL ELEMENTS IN THE DOCUMENT, AND EIGHT COLUMNS OF TWO THOUSAND ROWS IS SIXTEEN THOUSAND CELLS. The browser lays out all of it, holds all of it, and re-does the work whenever something changes. Which is why a large list is slow to appear AND slow to interact with afterwards. AND THE COMPONENTS ALREADY SOLVE THIS IF YOU USE THEM AS INTENDED. A data grid can render only what is on screen and reuse elements as the user scrolls, so two thousand rows cost about what twenty do. It is a property of the component with the right…
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