Simple example with 1000 rows and 1000 columns.
index.js
import { Canvas, TableView, DataModel } from './src/main.js'
const columns = new Array(1000).fill(null).map((e, i) => ({ visible: true, width: 70 }))
let index = 0
const cells = new Array(1000).fill(null)
.map(c => new Array(1000).fill(null).map((e, i) => ({ value: index++ })))
const input = document.getElementById('input')
const canvas = new Canvas('canvas', 'auto')
const tableView = new TableView(canvas.rootview.frame, DataModel.spreadsheet(columns, cells))
canvas.rootview.addSubview(tableView)index.html
<html>
<head>
<script src="./index.js" type="module"></script>
</head>
<body>
<canvas id="canvas" tabIndex="0" style="display:block;height:400px;width:600px"></canvas>
</body>
</html>