Feature/improve performance of chart calculation (#1271)

* Improve performance chart calculation

Co-Authored-By: gizmodus <11334553+gizmodus@users.noreply.github.com>

* Update changelog

Co-Authored-By: gizmodus <11334553+gizmodus@users.noreply.github.com>

* Improve chart tooltip of benchmark comparator

* Update changelog

Co-authored-by: gizmodus <11334553+gizmodus@users.noreply.github.com>

apps/client/src/app/components/benchmark-comparator/benchmark-comparator.component.ts

@@ -23,11 +23,7 @@ import {
   getTextColor,
   parseDate
 } from '@ghostfolio/common/helper';
-import {
-  LineChartItem,
-  UniqueAsset,
-  User
-} from '@ghostfolio/common/interfaces';
+import { LineChartItem, User } from '@ghostfolio/common/interfaces';
 import { DateRange } from '@ghostfolio/common/types';
 import {
   Chart,
@@ -215,7 +211,7 @@ export class BenchmarkComparatorComponent implements OnChanges, OnDestroy {
         locale: this.locale,
         unit: '%'
       }),
-      mode: 'index',
+      mode: 'x',
       position: <unknown>'top',
       xAlign: 'center',
       yAlign: 'bottom'