EtreCheck report took over 10 minutes to run. This is very unusual. --So what do I do now?

EtreCheck says my iMac is slow (which I know already). In Major Issues is says "Poor performance - EtreCheck report took over 10 minutes to run. This is very unusual." but that's all. Anyone have an idea where to look for a solution?

Hardware Information:

iMac (Retina 5K, 27-inch, Late 2015)

iMac Model: iMac17,1

1 3.2 GHz Intel Core i5 (i5-6500) CPU: 4-core

8 RAM At maximum

BANK 0/DIMM0

4 GB DDR3 1867 ok

BANK 0/DIMM1

Empty

BANK 1/DIMM0

4 GB DDR3 1867 ok

BANK 1/DIMM1

Empty

Video Information:

AMD Radeon R9 M390 - VRAM: 2 GB

iMac 5120 x 2880

Drives:

disk0 - APPLE HDD ST1000DM003 1.00 TB (Mechanical)

Internal SATA 3 Gigabit Serial ATA

disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk0s2 [Core Storage Container] 999.35 GB

disk2 - Macintosh HD (Journaled HFS+) [Fusion Drive] 1.02 TB

disk0s3 - Recovery HD (HFS+) [Recovery] 650 MB

disk1 - APPLE SSD AP0032H 24.00 GB (Solid State - TRIM: Yes)

Internal PCI-Express 5.0 GT/s x4 NVM Express

disk1s1 - EFI [EFI] 315 MB

disk1s2 [Core Storage Container] 23.55 GB

disk2 - Macintosh HD (Journaled HFS+) [Fusion Drive] 1.02 TB

disk1s3 - B*******X [Recovery] 134 MB

disk3 - Seagate Expansion 2.00 TB

External USB 5 Gbit/s

disk3s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk3s2 - A************A (Journaled HFS+) 2.00 TB

Mounted Volumes:

disk2 - Macintosh HD [Fusion Drive] 1.02 TB (547.63 GB free)

Journaled HFS+

Mount point: /

disk3s2 - A************A 2.00 TB (1.35 TB free)

Journaled HFS+

Mount point: /Volumes/A************A

Network:

Interface en0: Ethernet

Interface en1: Wi-Fi

802.11 a/b/g/n/ac

One IPv4 address

Interface en5: iPhone

Interface en4: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

System Software:

macOS High Sierra 10.13.3 (17D47)

Time since boot: About a day

System Load: 2.55 (1 min ago) 2.29 (5 min ago) 2.25 (15 min ago)