might be slightly faster like this

main.cpp

@@ -117,9 +117,8 @@ void displayThread(std::stop_token st, Sensors* s) {
             for (auto &fan : s->sys.fan_speed)
                 cpu_fan += fan;
             cpu_fan /= 2;
-
+            
             // write to display buffer
-            lcd.clearBuf();
             lcd.writeBuf(0, 0, pad(s->td.date, 11, true) + "   " + s->td.time + lcd.bar(7, s->gpu.usage_core / 100.0));
             lcd.writeBuf(0, 26, pNum(s->avg[0], s->avg[0] > 10 ? 1 : 2));
             lcd.writeBuf(0, 31, pNum(s->avg[1], s->avg[1] > 10 ? 1 : 2));
@@ -145,6 +144,7 @@ void displayThread(std::stop_token st, Sensors* s) {
         }
 
         lcd.flushBuf();
+        lcd.clearBuf();
     }
 
     lcd._open();