1 files changed, 27 insertions, 8 deletions
diff --git a/app/javascript/flavours/glitch/selectors/index.js b/app/javascript/flavours/glitch/selectors/index.js
index 2d4f3f7b4..9e4582532 100644
--- a/app/javascript/flavours/glitch/selectors/index.js
+++ b/app/javascript/flavours/glitch/selectors/index.js
@@ -1,5 +1,5 @@
 import { createSelector } from 'reselect';
-import { List as ImmutableList } from 'immutable';
+import { List as ImmutableList, is } from 'immutable';
 import { me } from 'flavours/glitch/util/initial_state';
 
 const getAccountBase         = (state, id) => state.getIn(['accounts', id], null);
@@ -36,12 +36,10 @@ const toServerSideType = columnType => {
   }
 };
 
-export const getFilters = (state, { contextType }) => state.get('filters', ImmutableList()).filter(filter => contextType && filter.get('context').includes(toServerSideType(contextType)) && (filter.get('expires_at') === null || Date.parse(filter.get('expires_at')) > (new Date())));
-
 const escapeRegExp = string =>
   string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
 
-export const regexFromFilters = filters => {
+const regexFromFilters = filters => {
   if (filters.size === 0) {
     return null;
   }
@@ -63,6 +61,27 @@ export const regexFromFilters = filters => {
   }).join('|'), 'i');
 };
 
+// Memoize the filter regexps for each valid server contextType
+const makeGetFiltersRegex = () => {
+  let memo = {};
+
+  return (state, { contextType }) => {
+    if (!contextType) return ImmutableList();
+
+    const serverSideType = toServerSideType(contextType);
+    const filters = state.get('filters', ImmutableList()).filter(filter => filter.get('context').includes(serverSideType) && (filter.get('expires_at') === null || Date.parse(filter.get('expires_at')) > (new Date())));
+
+    if (!memo[serverSideType] || !is(memo[serverSideType].filters, filters)) {
+      const dropRegex = regexFromFilters(filters.filter(filter => filter.get('irreversible')));
+      const regex = regexFromFilters(filters);
+      memo[serverSideType] = { filters: filters, results: [dropRegex, regex] };
+    }
+    return memo[serverSideType].results;
+  };
+};
+
+export const getFiltersRegex = makeGetFiltersRegex();
+
 export const makeGetStatus = () => {
   return createSelector(
     [
@@ -70,21 +89,21 @@ export const makeGetStatus = () => {
       (state, { id }) => state.getIn(['statuses', state.getIn(['statuses', id, 'reblog'])]),
       (state, { id }) => state.getIn(['accounts', state.getIn(['statuses', id, 'account'])]),
       (state, { id }) => state.getIn(['accounts', state.getIn(['statuses', state.getIn(['statuses', id, 'reblog']), 'account'])]),
-      getFilters,
+      getFiltersRegex,
     ],
 
-    (statusBase, statusReblog, accountBase, accountReblog, filters) => {
+    (statusBase, statusReblog, accountBase, accountReblog, filtersRegex) => {
       if (!statusBase) {
         return null;
       }
 
-      const dropRegex = (accountReblog || accountBase).get('id') !== me && regexFromFilters(filters.filter(filter => filter.get('irreversible')));
+      const dropRegex = (accountReblog || accountBase).get('id') !== me && filtersRegex[0];
 
       if (dropRegex && dropRegex.test(statusBase.get('reblog') ? statusReblog.get('search_index') : statusBase.get('search_index'))) {
         return null;
       }
 
-      const regex  = (accountReblog || accountBase).get('id') !== me && regexFromFilters(filters);
+      const regex  = (accountReblog || accountBase).get('id') !== me && filtersRegex[1];
       let filtered = false;
 
       if (statusReblog) {