Activity: performance optimisation

entity/Activity_entity/entityfields/category/displayValueProcess.js

-import("system.result");
-import("system.vars");
-import("Keyword_lib");
-import("KeywordRegistry_basic");
-
-result.string(KeywordUtils.getViewValue($KeywordRegistry.activityCategory(), vars.get("$field.CATEGORY")));
+import("system.result");
+import("system.vars");
+import("Keyword_lib");
+import("KeywordRegistry_basic");
+
+result.string(KeywordUtils.getViewValue($KeywordRegistry.activityCategory(), vars.get("$field.CATEGORY")));
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entity/Activity_entity/entityfields/subject_details/valueProcess.js

 import("system.vars");
 import("system.result");
-import("Keyword_lib");
-import("KeywordRegistry_basic");
 
-var histMedium = vars.get("$field.CATEGORY");
-result.string(vars.get("$field.SUBJECT") + (histMedium ? " (" + KeywordUtils.getViewValue($KeywordRegistry.activityCategory(), histMedium) + ")" : ""));
+var category = vars.get("$field.CATEGORY.displayValue");
+result.string(vars.get("$field.SUBJECT") + (category ? " (" + category + ")" : ""));
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