long delay in display of history graphs

When loading any history plot, there is a long delay after loading all the data and showing showing the history graphs. The delay is “many seconds”. The best I can tell, the fix in the following diff: call timeToXInit() after assigning values to this.x1 and this.x2. In the first call to draw() after loading the data I see timeToX() return NaN, all the x[] and y[] arrays are empty and nothing is plotted. K.O.

diff --git a/resources/mhistory.js b/resources/mhistory.js
index 095b499..ed5ecad 100644
--- a/resources/mhistory.js
+++ b/resources/mhistory.js
@@ -1710,9 +1710,6 @@ MhistoryGraph.prototype.draw = function () {
    if (this.yMax === undefined || Number.isNaN(this.yMax))
       return;

-   this.timeToXInit();  // initialize scale factor t -> x
-   this.valueToYInit(); // initialize scale factor v -> y
-
    let axisLabelWidth = this.drawVAxis(ctx, 50, this.height - 25, this.height - 35,
       -4, -7, -10, -12, 0, this.yMin, this.yMax, this.logAxis, false);

@@ -1721,6 +1718,9 @@ MhistoryGraph.prototype.draw = function () {
    this.x2 = this.width - 30;
    this.y2 = 26;

+   this.timeToXInit();  // initialize scale factor t -> x
+   this.valueToYInit(); // initialize scale factor v -> y
+
    // title

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