<p dir="auto"><strong>Describe the bug</strong></p>
<p dir="auto">I was using r112 and everything was ok, after upgrading to r120 I noticed a huge drop in fps when using composer render rather than the normal render.</p>
<p dir="auto">there are 7 objects, 2000 instanced objects.</p>
<p dir="auto">I know that 2000 sounds a big number, but it works well with normal rendering, and it was working well too in composer renders in r112!</p>
<p dir="auto"><em><strong>Live example</strong></em></p>
<p dir="auto"><a href="https://jsfiddle.net/xuqws0Lg/" rel="nofollow">https://jsfiddle.net/xuqws0Lg/</a></p>
<p dir="auto">you can switch between composer render and normal render in the animate function to see the diff</p>
<p dir="auto"><strong>Expected behavior</strong></p>
<p dir="auto">the expected behavior is that the composer renders in the same performance as normal render do.</p>
<p dir="auto"><strong>Platform:</strong></p>
<ul dir="auto">
<li>Device: Desktop</li>
<li>OS: Linux</li>
<li>Browser: Chrome</li>
<li>Three.js version: r120</li>
</ul>
<p dir="auto">OutlinePass causes performance issue especially on mesh with a lot of faces.<br>
I am not sure if this is bug or expected behavior. Thanks.</p>
<p dir="auto"><strong>Screenshots</strong><br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/42105279/93967893-d34c3800-fd9a-11ea-9a38-f0795b18bdf0.png"><img src="https://user-images.githubusercontent.com/42105279/93967893-d34c3800-fd9a-11ea-9a38-f0795b18bdf0.png" alt="image" style="max-width: 100%;"></a><br>
without outline (28ms)</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/42105279/93967940-eced7f80-fd9a-11ea-967c-7f7297ff07cb.png"><img src="https://user-images.githubusercontent.com/42105279/93967940-eced7f80-fd9a-11ea-967c-7f7297ff07cb.png" alt="image" style="max-width: 100%;"></a><br>
with outline on mesh(ground) with small number of faces. (57ms)</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/42105279/93968016-1ad2c400-fd9b-11ea-9a1a-ae505033191f.png"><img src="https://user-images.githubusercontent.com/42105279/93968016-1ad2c400-fd9b-11ea-9a1a-ae505033191f.png" alt="image" style="max-width: 100%;"></a><br>
with outline on mesh(tree) with a large number of faces. (170ms)</p>
<p dir="auto"><strong>Platform:</strong></p>
<ul dir="auto">
<li>Device: [Desktop]</li>
<li>OS: [MacOS]</li>
<li>Browser: [Chrome]</li>
<li>Three.js version: [r118]</li>
</ul>