Suggest Nvidia default settings and more information about Max Frame Rate (#1113)

* Smoothness, Max Frame Rate and vertical sync

* Suggest Nvidia default driver settings

* Improve Chinese translation

---------

Co-authored-by: Xu <blinue@outlook.com>

docs/Performance optimization.md

@@ -20,6 +20,8 @@ If your graphics card is powerful enough, but you are still experiencing lagging
 
 The following tips apply only to Nvidia users. Improper driver configuration on Nvidia graphics cards is likely the cause of the stuttering.
 
+Quick tips: Restore your Nvidia driver settings to default (clean install) will solve most problems. However, if you insist on use your own settings, let's explain how driver settings cause trouble to program.
+
 #### Strange fps drop after upscaling enabled for a while
 
 At the beginning, everything is fine (Game 60 FPS / Magpie 60 FPS). But after about 10~15 seconds, both game and magpie fps drop to about 37 FPS, at the same time GPU usage go up to 100%, GPU MHz goes down from like 1000 to 700.
@@ -46,12 +48,23 @@ For magpie, go with "Use the 3D application setting".
 
 At the same time, Game 60 FPS / Magpie 60 FPS. I find that this situation appears when I am using Magpie v0.10.6. Enable vertical sync in Magpie settings and use "Vertical sync: Use the 3D application setting" for Magpie program settings solved this. Upgrade to Magpie v0.11.1 also solved this.
 
-#### Low Lantancy Mode and Max Frame Rate
+#### Screen looks not smooth but FPS is decent
+
+Game 60 FPS / Magpie 60 FPS / Monitor 60 Hz, but some frames dropped after rendered, instead of present on screen. This also happens on native game Window without use scaling.
+
+Check Max Frame Rate and vertical sync. For example, you have 60 Hz monitor and set vertical sync on as mentioned above, you need to remove Max Frame Rate settings too, if you have set Max Frame Rate to 60 FPS before.
+
+If you have other frame limiter like MSI Afterburner RTSS, also turn it of.
+
+Mislead:
+1. Set global Max Frame Rate to 60 FPS and turn off Max Frame Rate for certain program, this will not work as intend. When you have program Max Frame Rate off and vertical sync off, but you have global Max Frame Rate, game and Magpie still follow global Max Frame Rate limit.
+1. Use Max Frame Rate as "better vertical sync method" because they say "by doing this can reduce input lag". No, Max Frame Rate is not vertical sync, it doesn't guarantee every rendered frame to be present on monitor, which is "old fashion vertical sync" will do.
+
+#### Low Lantancy Mode
 
 Check these options if you encountered some other strange behavior. I'm not sure if Magpie has these issue, but for Lossless Scaling, use "Low Lantancy Mode: Ultra" will cause WGC API drag and drop position step back after release mouse button.
 
-Set "Low Lantancy Mode: Off" and "Max Frame Rate: Off" for Magpie.
-For game, set "Max Frame Rate: Off", but you can leave "Low Lantancy Mode: Ultra" for games if needed.
+Set "Low Lantancy Mode: Off" for Magpie. But you may leave "Low Lantancy Mode: Ultra" for games if needed and you know it won't cause bug. For example, some old DirectX 9 game doesn't work well with this setting, it cause frame drop and input lag, if that happen just set it to off.
 
 </details>
 

docs/性能优化建议.md

@@ -20,6 +20,8 @@
 
 以下提示仅适用于 Nvidia 用户。Nvidia 显卡的驱动程序配置不当可能是造成卡顿的原因。
 
+快速提示：将 Nvidia 驱动程序设置恢复为默认设置（全新安装）将解决大多数问题。但是，如果您坚持使用自己的设置，让我们解释一下驱动程序设置如何给程序带来麻烦。
+
 #### 缩放一段时间后出现奇怪的帧率下降
 
 刚开始时一切正常（游戏 60 FPS / Magpie 60 FPS），但大约 10~15 秒后，游戏和 Magpie 的帧率都会下降到 37 FPS 左右，同时 GPU 占用率飙升至 100%，GPU 频率从约 1000MHz 降至 700MHz。
@@ -63,12 +65,23 @@
 * 在 Magpie 设置中启用垂直同步，并在 Nvidia 控制面板中将 Magpie 的垂直同步设置为“使用 3D 应用程序设置”。
 * 升级到 Magpie v0.11.1 也能解决此问题。
 
-#### 低延迟模式与最大帧率
+#### 屏幕观感不流畅，但帧率看起来正常
+
+游戏 60 FPS / Magpie 60 FPS / 显示器 60 Hz，但出现丢帧。这种情况在未缩放、直接运行游戏窗口时也会发生。
+
+请检查是否启用了“最大帧率限制”和垂直同步。例如，在上述情况下，如果你已经打开了垂直同步，同时将最大帧率限制设为 60 FPS，请移除该限制。
+
+如果你有其他帧率限制程序（如 MSI Afterburner RTSS），也请将其关闭。
+
+常见误区：
+1. 将“最大帧率”设置为全局 60 FPS，然后对某些程序关闭帧率限制，这实际上不会如你所愿生效。如果你对程序关闭了最大帧率限制和垂直同步，但启用了全局最大帧率，游戏和 Magpie 仍会遵循全局的帧率限制。
+1. 有人将“最大帧率”视作更优的垂直同步方法，理由是“这样可以降低输入延迟”。其实并非如此。最大帧率限制并不是垂直同步，它无法保证每一帧都能被完整呈现，而传统的垂直同步正是为此目的而设计的。
+
+#### 低延迟模式
 
 如果遇到其他奇怪的现象，可以检查这些选项。我不确定 Magpie 是否有这些问题，但对于 Lossless Scaling，使用“低延迟模式：超高”会导致 WGC API 缩放后拖拽鼠标时，释放鼠标按钮后鼠标位置和释放按钮时不一致。
 
-为 Magpie 设置“低延迟模式：关闭”和“最大帧率：关闭”。
-对于游戏，设置“最大帧率：关闭”，如果需要，保留“低延迟模式：超高”。
+为 Magpie 设置“低延迟模式：关闭”。但对于游戏，如果你确定启用“低延迟模式：超高”不会引发问题，也可以保留该设置。例如，一些旧的 DirectX 9 游戏在启用此模式后可能会出现掉帧或输入延迟问题，如果遇到这种情况，建议将其关闭。
 
 </details>