diff --git a/src/app.controller.ts b/src/app.controller.ts
index a992f63..f8e5156 100644
--- a/src/app.controller.ts
+++ b/src/app.controller.ts
@@ -33,8 +33,8 @@ export class AppController {
 
     const chartData = await this.clientStatisticsService.getChartDataForSite();
 
-    await this.cacheManager.set(CACHE_KEY, chartData, 600);
-
+    //5 min
+    await this.cacheManager.set(CACHE_KEY, chartData, 5 * 60 * 1000);
 
     return {
       chartData,
diff --git a/src/models/StratumV1ClientStatistics.ts b/src/models/StratumV1ClientStatistics.ts
index dd2cf78..fa999a8 100644
--- a/src/models/StratumV1ClientStatistics.ts
+++ b/src/models/StratumV1ClientStatistics.ts
@@ -58,7 +58,7 @@ export class StratumV1ClientStatistics {
 
         const targetDifficulty = difficultyPerSecond * TARGET_SUBMISSION_PER_SECOND;
 
-        if (clientDifficulty << 1 < targetDifficulty || clientDifficulty >> 1 > targetDifficulty) {
+        if ((clientDifficulty * 2) < targetDifficulty || (clientDifficulty / 2) > targetDifficulty) {
             return this.nearestPowerOfTwo(targetDifficulty)
         }