Different behaviour between local notebook and Cloud deployed Manipulate function

Question

I've been happy with my development in the Wolfram Language but haven't played with deploying manipulatable content before. I've written a rather basic Manipulate function to let users explore changing chord lengths on a spline. It's working as expected in my local notebook. It initializes a random spline and then lets the user change the chord length, and if desired choose a new random spline. However, when I deploy the function to the cloud (it's actually composed of 7 functions with the main two viz functions listed below) it unforuately triggers new random spline whenever the slider is moved. It's slow and not the desired behaviour. I isolated the set of functions in a new notebook and still the behaviour persists. I think I'm missing something about how variables are different locally and deployed. Does anyone have any suggestions about how to correct this behaviour?

dynamicViz[controlpoints_, step_] := Module[{var, curve, results},
  curve = DiscretizeGraphics[BSplineCurve[controlpoints]];
  results = objectiveFunction[controlpoints, step];
  
  Graphics[{
    {Orange, AbsoluteThickness[3], MeshPrimitives[curve, 1]},
    {Red, AbsoluteThickness[5], Line@results[["points"]]},
    {Black, AbsolutePointSize[7], Point /@ results[["points"]]}
    },
   PlotLabel -> Style[
     "Chord Length: " <> ToString@step <>
      " | Error: " <> 
      ToString@Round[results[["error"]] , 0.1] <>
      " | Count: " <> 
      ToString@Length@(results[["points"]] - 1),
     20, FontFamily -> "Sans Source Pro"
     ],
   AspectRatio -> Automatic,
   ImageMargins -> 20,
   ImageSize -> 700,
   Frame -> True,
   GridLines -> Automatic
   ]
  ]

CloudDeploy[
 Manipulate[
  dynamicViz[pts, step], {{step, 2000, Style["Chord Length", 20]}, 300,
    4000, 20}, Button["New Spline", pts = control], 
  Initialization :> {pts = control}]
]

Currently this deployed public version is active as of Dec 18 2020 so one can see the behaviour.