diff --git a/compile.sh b/compile.sh
index a258888..97c8cc7 100755
--- a/compile.sh
+++ b/compile.sh
@@ -21,6 +21,7 @@ mkdir -p "$PACK_DIR"
 # compile ts
 node_modules/.bin/tsc -p "$SOURCE_DIR" --outDir "$PACK_DIR"
 
+# run tslint
 node_modules/tslint/bin/tslint --project "$SOURCE_DIR"/tsconfig.json --config "$SOURCE_DIR"/tslint.json
 
 # make commonjs bundle for ANDROID 
diff --git a/src/nativescript-intl-common.ts b/src/nativescript-intl-common.ts
index 7bf7609..018fdcf 100644
--- a/src/nativescript-intl-common.ts
+++ b/src/nativescript-intl-common.ts
@@ -10,6 +10,7 @@ export const LONG = "long";
 export const SHORT = "short";
 export const TWODIGIT = "2-digit";
 export const FULL = "full";
+export let resolvedPatterns = new Map();
 
 export class DateTimeFormat implements intlDateTimeFormat {
     constructor(private locale?: string, private options?: intlDateTimeFormatOptions, private pattern?: string) {
@@ -200,7 +201,12 @@ export class DateTimeFormat implements intlDateTimeFormat {
             if (this.pattern) {
                 this._preparedPattern = this.pattern;
             } else {
-                this._preparedPattern = this.preparePattern(this.getCorrectPatternForLocale(), this.options);
+                if (resolvedPatterns.has({locale: this.locale, options: this.options})) {
+                    this._preparedPattern = resolvedPatterns.get({locale: this.locale, options: this.options});
+                } else {
+                    this._preparedPattern = this.preparePattern(this.getCorrectPatternForLocale(), this.options);
+                    resolvedPatterns.set({locale: this.locale, options: this.options}, this._preparedPattern);
+                }
             }
         }
         return this._preparedPattern;