<h1 dir="auto">Environment</h1>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Windows build number: 10.0.18632.175
Windows Terminal version (if applicable): 0.2.1715.0 (Windows Store Preview)
NVIDIA drivers version 430.64
NVIDIA GTX 1060 6GB graphics card
Dell Alienware AW3418DW monitor (GSYNC certified)"><pre lang="none" class="notranslate"><code class="notranslate">Windows build number: 10.0.18632.175
Windows Terminal version (if applicable): 0.2.1715.0 (Windows Store Preview)
NVIDIA drivers version 430.64
NVIDIA GTX 1060 6GB graphics card
Dell Alienware AW3418DW monitor (GSYNC certified)
</code></pre></div>
<h1 dir="auto">Steps to reproduce</h1>
<ol dir="auto">
<li>Connect GSYNC compatible monitor to a computer with an NVIDIA GPU</li>
<li>Enable GSYNC, in either of the available modes</li>
<li>Open Windows Terminal Preview</li>
<li>Scroll mouse around</li>
</ol>
<h1 dir="auto">Expected behaviour</h1>
<p dir="auto">Normal performance without any jittering or lagging as demonstrated in the talks from Build 2019.</p>
<h1 dir="auto">Actual behaviour</h1>
<p dir="auto">Significant jitter throughout the entire UI, including other windows, when Terminal is the active window. I attempted to capture it on video, but unfortunately, both direct capture using OBS and my phone camera were unable to capture it.</p>
<h1 dir="auto">Additional information</h1>
<p dir="auto">This issue also occurs with the Spotify app, in which disabling hardware acceleration leads to the issue being fixed. I was unable to test this with the Terminal app, as I could not find an option to configure hardware acceleration. I imagine this will be a problem with most variable refresh rate configurations, however, I have been unable to test this as I only have NVIDIA hardware available.</p>
<p dir="auto">My main monitor is 144Hz. An easy way of seeing the current FPS is wiggling the mouse - the movement in 144 FPS is much smoother than 60 FPS, and this is <strong>very</strong> noticeable.</p>
<p dir="auto">While using Terminal, the FPS constantly drops, and moves between low FPS and full 144 FPS. I can't tell if it drops to 60 FPS or a different amount, but it's way lower than 144 FPS. Wiggling the cursor while typing shows this problem well.</p>
<p dir="auto">It seems like every interaction with the Terminal can cause the FPS to "flip" between low and high: Focusing on the window, typing, etc. Sometimes waiting ~3 seconds is enough for the FPS to switch back to high.</p>
<p dir="auto">Graphics card is an <code class="notranslate">Nvidia GTX 1080 Ti</code> and monitor is an <code class="notranslate">Asus PG279Q</code>.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="C:\WINDOWS\system32&gt;ver

Microsoft Windows [Version 10.0.18362.86]"><pre class="notranslate"><code class="notranslate">C:\WINDOWS\system32&gt;ver

Microsoft Windows [Version 10.0.18362.86]
</code></pre></div>