WD Red 8TB Throughput_Performance

I have 4 8TB Reds in a NAS and viewing smart info the raw value for Throughput_Performance is lower on one drive. The values are 120, 116,116 and 52. Here is the smart info for the one I’m concerned about. See line 2.

=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000b 100 100 016 Pre-fail Always - 0
2 Throughput_Performance 0x0005 147 147 054 Pre-fail Offline - 52
3 Spin_Up_Time 0x0007 156 156 024 Pre-fail Always - 438 (Average 405)
4 Start_Stop_Count 0x0012 100 100 000 Old_age Always - 113
5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 0
7 Seek_Error_Rate 0x000b 100 100 067 Pre-fail Always - 0
8 Seek_Time_Performance 0x0005 140 140 020 Pre-fail Offline - 15
9 Power_On_Hours 0x0012 100 100 000 Old_age Always - 74
10 Spin_Retry_Count 0x0013 100 100 060 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 60
22 Helium_Level 0x0023 100 100 025 Pre-fail Always - 100
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 134
193 Load_Cycle_Count 0x0012 100 100 000 Old_age Always - 134
194 Temperature_Celsius 0x0002 166 166 000 Old_age Always - 39 (Min/Max 22/45)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0
197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0008 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x000a 200 200 000 Old_age Always - 0

It passes the smart short test, just wondering if the lower number means anything. I would think they all should be about the same

What is the test result?

Smart test just gives a pass.