make perf manager load faster

rowers/views/analysisviews.py

@@ -1257,6 +1257,13 @@ def performancemanager_view(request, userid=0, mode='rower',
     doform = therower.showfresh
     dofatigue = therower.showfit
 
+    script = ''
+    thediv = 'Submit form to create chart'
+    endfitness = 0
+    endfatigue = 0
+    endform = 0
+    ids = []
+
     if request.method == 'POST':
         form = PerformanceManagerForm(request.POST)
         if form.is_valid():
@@ -1268,21 +1275,22 @@ def performancemanager_view(request, userid=0, mode='rower',
             therower.showfresh = doform
             therower.showfatigue = dofatigue
             therower.save()
+            script, thediv, endfitness, endfatigue, endform, ids = performance_chart(
+                theuser, startdate=startdate, enddate=enddate,
+                kfitness=kfitness,
+                kfatigue=kfatigue,
+                metricchoice=metricchoice,
+                doform=doform,
+                dofatigue=dofatigue,
+                showtests=True,
+            )
     else:
         form = PerformanceManagerForm(initial={
             'doform': doform,
             'dofatigue': dofatigue,
         })
 
-    script, thediv, endfitness, endfatigue, endform, ids = performance_chart(
+
-        theuser, startdate=startdate, enddate=enddate,
-        kfitness=kfitness,
-        kfatigue=kfatigue,
-        metricchoice=metricchoice,
-        doform=doform,
-        dofatigue=dofatigue,
-        showtests=True,
-    )
 
     ids = pd.Series(ids, dtype='int').dropna().values