feat: introduce DURATION to visualization

Signed-off-by: Matej Focko <mfocko@redhat.com>

visualization.js

@@ -1,3 +1,5 @@
+const DURATION = 500;
+
 class Recorder {
     constructor(graph) {
         this.graph = graph;
@@ -21,7 +23,7 @@ class Recorder {
                 .ease(d3.easeLinear)
                 .on("end", this.unblockRendering)
                 .delay(500)
-                .duration(1500)
+                .duration(DURATION)
         );
     }