Revert "fix: temporary fix for fps drop issue when starting stream with graph disabled"

This reverts commit d72930877a.

VoidLink/ImGuiRenderer.h

@@ -20,7 +20,6 @@ typedef void (^MetricsHandler)(int plotId, CFTimeInterval value);
 @property (nonatomic) FloatBuffer * _Nonnull frametimes;
 @property (nonatomic) BOOL enableGraphs;
 @property (nonatomic) float graphOpacity;
-@property (nonatomic) int streamFps;
 @property (nonatomic) BOOL imguiRunning;
 @property (nonatomic) MetricsHandler _Nonnull metricsHandler;
 

VoidLink/ImGuiRenderer.mm

@@ -30,7 +30,6 @@
     _enableGraphs = enableGraphs;
     _graphOpacity = (float)(graphOpacity / 100.0);
     _bounds = bounds;
-    _streamFps = streamFps;
     _device = MTLCreateSystemDefaultDevice();
     _commandQueue = [_device newCommandQueue];
 
@@ -84,46 +83,34 @@
 
     self.mtkView.device = self.device;
     self.mtkView.delegate = self;
-    self.mtkView.preferredFramesPerSecond = _streamFps; // Match the stream frame rate for proper display sync
+    self.mtkView.preferredFramesPerSecond = 60; // ImGui overlay will always render at this rate
     self.mtkView.opaque = NO;
     self.mtkView.enableSetNeedsDisplay = NO;
 
     if (_enableGraphs) {
         [self ImGui_Init];
         self.mtkView.paused = NO;
-        self.mtkView.hidden = NO;
     }
     else {
-        // Keep Metal view running for display sync but don't initialize ImGui
+        self.mtkView.paused = YES;
-        self.mtkView.paused = NO;
-        self.mtkView.hidden = YES; // Hide but keep running for display sync
     }
 }
 
 // start & stop are used to show/hide graphs when swiping stats in or out
 -(void)start {
-    if (_enableGraphs) {
     [self ImGui_Init];
-        self.mtkView.hidden = NO;
+    if (_enableGraphs) {
-    } else {
-        // Keep running for display sync but stay hidden
-        self.mtkView.hidden = YES;
-    }
         self.mtkView.paused = NO;
     }
+}
 
 -(void)show {
-    if (_enableGraphs) {
     [self.mtkView setHidden:NO];
 }
-}
 
 -(void)hide {
-    if (_enableGraphs) {
     [self.mtkView setHidden:YES];
 }
-    // When graphs are disabled, ImGui stays hidden but keeps running for display sync
-}
 
 -(void)stop {
     self.mtkView.paused = YES;
@@ -133,15 +120,6 @@
 // Only called when mtkView.paused is false
 - (void)drawInMTKView:(MTKView *)view
 {
-    id<MTLCommandBuffer> commandBuffer = [self.commandQueue commandBuffer];
-
-    MTLRenderPassDescriptor* renderPassDescriptor = view.currentRenderPassDescriptor;
-    if (renderPassDescriptor == nil) {
-        [commandBuffer commit];
-        return;
-    }
-
-    if (_enableGraphs) {
 #if !defined(IMGUI_DISABLE)
     ImGuiIO &io = ImGui::GetIO();
     io.DisplaySize.x = view.bounds.size.width;
@@ -150,6 +128,14 @@
     CGFloat framebufferScale = view.window.screen.scale ?: UIScreen.mainScreen.scale;
     io.DisplayFramebufferScale = ImVec2(framebufferScale, framebufferScale);
 
+    id<MTLCommandBuffer> commandBuffer = [self.commandQueue commandBuffer];
+
+    MTLRenderPassDescriptor* renderPassDescriptor = view.currentRenderPassDescriptor;
+    if (renderPassDescriptor == nil) {
+        [commandBuffer commit];
+        return;
+    }
+
     // Start the Dear ImGui frame
     ImGui_ImplMetal_NewFrame(renderPassDescriptor);
     ImGui::NewFrame();
@@ -175,25 +161,15 @@
     ImGui_ImplMetal_RenderDrawData(draw_data, commandBuffer, renderEncoder);
     [renderEncoder popDebugGroup];
     [renderEncoder endEncoding];
-#endif
-    } else {
-        // When graphs are disabled, just render a transparent frame for display sync
-        renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0);
 
-        id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
+    // Present
-        [renderEncoder pushDebugGroup:@"Display sync frame"];
-        // Don't render anything, just clear
-        [renderEncoder popDebugGroup];
-        [renderEncoder endEncoding];
-    }
-
-    // Present (always with timing for display sync)
 #if TARGET_OS_SIMULATOR
     [commandBuffer presentDrawable:view.currentDrawable];
 #else
     [commandBuffer presentDrawable:view.currentDrawable afterMinimumDuration:1.0 / view.preferredFramesPerSecond];
 #endif
     [commandBuffer commit];
+#endif
 }
 
 - (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size