This example uses OpenLayers v10.9.0. The latest is v.
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#### Synthetic Lines

vector 86

#####

Synthetic lines example.

##### main.js

    import Feature from 'ol/Feature.js';
    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import LineString from 'ol/geom/LineString.js';
    import VectorLayer from 'ol/layer/Vector.js';
    import VectorSource from 'ol/source/Vector.js';
    import Stroke from 'ol/style/Stroke.js';
    import Style from 'ol/style/Style.js';

    const count = 10000;
    const features = new Array(count);

    let startPoint = [0, 0];
    let endPoint;

    let delta, deltaX, deltaY;
    let signX = 1;
    let signY = -1;

    // Create a square spiral.
    let i;
    for (i = 0; i < count; ++i) {
      delta = (i + 1) * 2500;
      if (i % 2 === 0) {
        signY *= -1;
      } else {
        signX *= -1;
      }
      deltaX = delta * signX;
      deltaY = delta * signY;
      endPoint = [startPoint[0] + deltaX, startPoint[1] + deltaY];
      features[i] = new Feature({
        'geometry': new LineString([startPoint, endPoint]),
      });
      startPoint = endPoint;
    }

    const vector = new VectorLayer({
      source: new VectorSource({
        features: features,
        wrapX: false,
      }),
      style: new Style({
        stroke: new Stroke({
          color: '#666666',
          width: 1,
        }),
      }),
    });

    const view = new View({
      center: [0, 0],
      zoom: 0,
    });

    const map = new Map({
      layers: [vector],
      target: 'map',
      view: view,
    });

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>Synthetic Lines</title>
        <link rel="stylesheet" href="node_modules/ol/ol.css">
        <style>
          .map {
            width: 100%;
            height: 400px;
          }
        </style>
      </head>
      <body>
        <div id="map" class="map"></div>

        <script type="module" src="main.js"></script>
      </body>
    </html>

##### package.json

    {
      "name": "synthetic-lines",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }