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<!DOCTYPE html>
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<h1><a href="./blog.html">Blog</a> / How Does xeokit Load Large Models so Quickly?</h1>
<p class="lead">by <a href="http://xeolabs.com">xeolabs</a>
</p>
<hr>
<p>Posted on Febuary 1, 2020</p>
<hr>
<img class="img-responsive rounded no-padding" src="./img/BimdataViewerCropped.jpg" alt="">
<blockquote><p><b>xeokit's unmatched loading and rendering speed</b> enables us to create interactive and
customizable Web visualization experiences for large BIM models, even when loading many large models
simultaneously.</p>
<cite><a href="https://www.linkedin.com/in/hugo-duroux-46262166/" target="_external">Hugo Duroux</a>,
Technical
Director at <a href="https://bimdata.io" target="_external">BIMData.io</a></cite>
</blockquote>
<hr>
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<div class="col-md-12">
<p class="lead">The xeokit SDK's fastest loading format is its native, binary XKT format, which consists of
a single
BLOB containing a model, compressed using geometry quantization and DEFLATE compression.</p>
<p>Open source CLI tools are available to convert IFC STEP, glTF and DAE files into XKT format for efficient
loading by xeokit. An open source CLI tool is also available to extract JSON IFC metadata, to load
alongside the
model
geometry. These tools can be easily scripted to build automated IFC -> xeokit data pipelines, and are
even available as a <a href="" target="_external">Docker image</a> for easy installation.</p>
<p>The table below shows the compression and transmission performance of xeokit's native XKT format. Click
the
links in the left column to try the demos in your browser.</p>
TODO: https://github.com/xeokit/xeokit-gltf-to-xkt/issues/1
<div class="table">
<table class="table table-bordered">
<tbody>
<tr>
<th style="text-align:left"> Demo</th>
<th style="text-align:left"> IFC Size</th>
<th style="text-align:left"> XKT Size</th>
<th style="text-align:left"> Compress. Ratio</th>
<th style="text-align:left"> Objects</th>
<th style="text-align:left"> Load Time</th>
<th style="text-align:left"> Model Info</th>
</tr>
<tr>
<td style="text-align:left"><a target="_examples"
href="https://xeokit.github.io/xeokit-sdk/examples/#BIMOffline_XKT_Duplex">Duplex</a>
</td>
<td style="text-align:left"> 0.52M</td>
<td style="text-align:left"> 0.12M</td>
<td style="text-align:left"> 4:1</td>
<td style="text-align:left"> 291</td>
<td style="text-align:left"> ~0.6s</td>
<td style="text-align:left"><a target="_external"
href="http://openifcmodel.cs.auckland.ac.nz/Model/Details/274">Info</a>
</td>
</tr>
<tr>
<td style="text-align:left"><a target="_examples"
href="https://xeokit.github.io/xeokit-sdk/examples/#BIMOffline_XKT_Schependomlaan">Schependomlaan</a>
</td>
<td style="text-align:left"> 49.2M</td>
<td style="text-align:left"> 1.5M</td>
<td style="text-align:left"> 32:1</td>
<td style="text-align:left"> 3504</td>
<td style="text-align:left"> ~0.8s</td>
<td style="text-align:left"><a target="_external"
href="https://github.com/openBIMstandards/DataSetSchependomlaan">Info</a>
</td>
</tr>
<tr>
<td style="text-align:left"><a target="_examples"
href="https://xeokit.github.io/xeokit-sdk/examples/#BIMOffline_XKT_OTCConferenceCenter">OTC
Conference Center</a></td>
<td style="text-align:left"> 71.7M</td>
<td style="text-align:left"> 5.0M</td>
<td style="text-align:left"> 14:1</td>
<td style="text-align:left"> 6462</td>
<td style="text-align:left"> ~1.0s</td>
<td style="text-align:left"><a target="_external"
href="http://openifcmodel.cs.auckland.ac.nz/Model/Details/304">Info</a>
</td>
</tr>
<tr>
<td style="text-align:left"><a target="_examples"
href="https://xeokit.github.io/xeokit-sdk/examples/#BIMOffline_XKT_WestRiverSideHospital">West
Riverside Hospital</a><br>(7 models)
</td>
<td style="text-align:left"> 162.7M</td>
<td style="text-align:left"> 31.94M</td>
<td style="text-align:left"> 5:1</td>
<td style="text-align:left"> 50895</td>
<td style="text-align:left"> ~5.0s</td>
<td style="text-align:left"><a target="_external"
href="http://openifcmodel.cs.auckland.ac.nz/Model/Details/308">Info</a>
</td>
</tr>
<tr>
<td style="text-align:left"><a target="_external" target="_examples"
href="https://xeokit.github.io/xeokit-sdk/examples/#BIMOffline_XKT_HolterTower">Holter
Tower</a></td>
<td style="text-align:left"> 68.6M</td>
<td style="text-align:left"> 4.8M</td>
<td style="text-align:left"> 14:1</td>
<td style="text-align:left"> 60284</td>
<td style="text-align:left"> ~1.8s</td>
<td style="text-align:left"><a target="_external"
href="http://openifcmodel.cs.auckland.ac.nz/Model/Details/316">Info</a>
</td>
</tr>
</tbody>
</table>
<center>
<div class="tablecaption">xeokit XKT format loading performance</div>
</center>
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iure!</p>
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