Should improve perf somewhat

src/cljs/auto_ap/views/pages/payments.cljs

@@ -28,17 +28,25 @@
  (fn [db]
    (-> db ::payment-page)))
 
+(re-frame/reg-sub
+ ::last-params
+ (fn [db]
+   (-> db ::last-params)))
+
 (re-frame/reg-sub
  ::params
+ :<- [::last-params]
  :<- [::subs/client]
  :<- [::side-bar/filter-params]
  :<- [::table/table-params]
- (fn [[client filter-params table-params]]
-   (re-frame/dispatch [::params-change])
-   (cond-> {}
-     client (assoc :client-id (:id client))
-     (seq filter-params) (merge filter-params)
-     (seq table-params) (merge @(re-frame/subscribe [::table/table-params])))))
+ (fn [[last-params client filter-params table-params]]
+   (let [params (cond-> {}
+           client (assoc :client-id (:id client))
+           (seq filter-params) (merge filter-params)
+           (seq table-params) (merge table-params))]
+     (when (not= last-params params)
+       (re-frame/dispatch [::params-change]))
+     params)))
 
 (re-frame/reg-event-fx
  ::params-change
@@ -104,11 +112,9 @@
                    :status (re-frame/subscribe [::subs/status])
                    :void-event [::void-check]}]]))
 
-
 (defn payments-page []
   (reagent/create-class
    {:display-name "payments-page"
-    :component-did-mount #(re-frame/dispatch [::params-change {}])
     :component-will-unmount #(re-frame/dispatch [::unmounted])
     :reagent-render
     (fn []