Fedora 20 graphics (?!) slow, no matter if gnome 3, gnome classic, KDE, Mate

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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     0x002f   100   100   050    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0027   100   100   050    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0023   100   100   002    Pre-fail  Always       -       2254
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       763
  5 Reallocated_Sector_Ct   0x0033   092   092   010    Pre-fail  Always       -       182
  7 Seek_Error_Rate         0x002f   100   100   050    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0025   100   100   050    Pre-fail  Offline      -       0
  9 Power_On_Hours          0x0032   082   082   000    Old_age   Always       -       7482
 10 Spin_Retry_Count        0x0033   115   100   030    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       763
183 Runtime_Bad_Block       0x0032   100   100   001    Old_age   Always       -       2
184 End-to-End_Error        0x0033   100   100   097    Pre-fail  Always       -       0
185 Unknown_Attribute       0x0032   100   100   001    Old_age   Always       -       65535
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0
189 High_Fly_Writes         0x003a   100   100   001    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0022   044   042   040    Old_age   Always       -       56 (Min/Max 28/58)
191 G-Sense_Error_Rate      0x0032   100   100   000    Old_age   Always       -       24
192 Power-Off_Retract_Count 0x0022   100   100   000    Old_age   Always       -       3932220
193 Load_Cycle_Count        0x0032   078   078   000    Old_age   Always       -       226361
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       39
197 Current_Pending_Sector  0x0032   100   100   000    Old_age   Always       -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       2

What we can figure out from above results is that the HDD needs to be replaced. What are the values that indicate such action ? From where we can see that this disk is damaged ?

  5 Reallocated_Sector_Ct   0x0033   092   092   010    Pre-fail  Always       -       182
  196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       39

What a reallocated sector is ? How this RAW_VALUE is a red alert for the health of the HDD ?

As we can read from Wikipedia

Reallocated_Sector_Ct

Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks that sector as "reallocated" and transfers data to a special reserved area (spare area). This process is also known as remapping, and reallocated sectors are called "remaps". The raw value normally represents a count of the bad sectors that have been found and remapped. Thus, the higher the attribute value, the more sectors the drive has had to reallocate. This allows a drive with bad sectors to continue operation; however, a drive which has had any reallocations at all is significantly more likely to fail in the near future.[3] While primarily used as a metric of the life expectancy of the drive, this number also affects performance. As the count of reallocated sectors increases, the read/write speed tends to become worse because the drive head is forced to seek to the reserved area whenever a remap is accessed. If sequential access speed is critical, the remapped sectors can be manually marked as bad blocks in the file system in order to prevent their use.

and

Reallocation Event Count

Count of remap ...