diff --git a/TODO.md b/TODO.md
index 03e64ae2e..4c717e6bb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,4 @@
 # to-do
 
 - finish auto-clone
-- new oscilloscope renderer - custom code that uses texture and fixes two issues: too many vertices, and broken anti-aliasing
 - new pattern renderer - performance improvements
diff --git a/src/gui/render/renderGL.cpp b/src/gui/render/renderGL.cpp
index ac26561e7..724949b25 100644
--- a/src/gui/render/renderGL.cpp
+++ b/src/gui/render/renderGL.cpp
@@ -116,8 +116,8 @@ const char* sh_oscRender_srcF=
   "  }\n"
   "  if ((fur_fragCoord.y-uLineWidth)>valmax*uResolution.y) discard;\n"
   "  if ((fur_fragCoord.y+uLineWidth)<valmin*uResolution.y) discard;\n"
-  "  float slope=abs(valmax-valmin)*uResolution.y;\n"
-  "  float slopeDiv=min(1.0,2.0/ceil(slope));\n"
+  "  float slope=sqrt(abs(valmax-valmin)*uResolution.y);\n"
+  "  float slopeDiv=min(1.0,1.0/ceil(slope));\n"
   "  float xRight=ceil(fur_fragCoord.x+uLineWidth);\n"
   "  for (float x=max(0.0,floor(fur_fragCoord.x-uLineWidth)); x<=xRight; x+=slopeDiv) {\n"
   "    float val0=texture2D(oscVal,vec2(floor(x)*oneStep,1.0)).x*uResolution.y;\n"