diff --git a/src/Main/Main.fs b/src/Main/Main.fs
index d4fad1159..c1237be04 100644
--- a/src/Main/Main.fs
+++ b/src/Main/Main.fs
@@ -57,7 +57,7 @@ let isMacos = Api.``process``.platform = Base.Darwin
 let isWin = Api.``process``.platform = Base.Win32
 
         
-//mainProcess.app.commandLine.appendSwitch("js-flags", "--expose-gc --trace-gc --trace-gc-ignore-scavenger --enable-logging --max-old-space-size=3500 --min-semi-space-size=64")
+mainProcess.app.commandLine.appendSwitch("js-flags", "--expose-gc --trace-gc --trace-gc-ignore-scavenger --enable-logging --max-old-space-size=3600 --min-semi-space-size=64")
 
 
 mainProcess.app.name <- "Issie"
diff --git a/src/Renderer/UI/ModelHelpers.fs b/src/Renderer/UI/ModelHelpers.fs
index f1cd90405..9b1b903ac 100644
--- a/src/Renderer/UI/ModelHelpers.fs
+++ b/src/Renderer/UI/ModelHelpers.fs
@@ -21,7 +21,7 @@ module Constants =
             FontWeight = 500 // weight of text on waveforms
             }
     let maxWarnSimulationSize = 100000
-    let maxSimulationSize = 10000000
+    let maxSimulationSize = 4000000
     let minScrollingWindow = 200
     let wsButtonHeight = 30
     let wsButtonWidth = 120
diff --git a/src/Renderer/UI/UIPopups.fs b/src/Renderer/UI/UIPopups.fs
index 75da9ca71..f1088a8bb 100644
--- a/src/Renderer/UI/UIPopups.fs
+++ b/src/Renderer/UI/UIPopups.fs
@@ -530,7 +530,9 @@ let dialogWaveSimConfigPopup (dispatch: Msg -> unit) (model:Model) =
             ["fontweight"], not <| inBounds 100 900 c.FontWeight, $"Font weight must be between 100 and 900"
             [], warnSizeLarge c, $"Warning: very large simulation lengths and big designs result in high memory use and low performance. \
                                    Simulation data memory use for the current design is estimated as\n: \
-                                   {arraySizeMessage c}, in addition up to 5GB will be required for heap and code."                                                                
+                                   {arraySizeMessage c}, in addition up to 5GB will be required for heap and code. \
+                                   Windows systems using more than 6GB simulation array memory are likely to crash. This limit does not \
+                                   depend on PC physical memory."                                                                
         ]  
         |> List.filter (fun (_, isError, _) -> isError)
         |> List.map (fun (key, _, message) -> key, message)