I tried reseting the SMC again, but no luck. The beachball is still showing up quite often. The results of etrecheck are pasted below.
EtreCheck version: 3.0.3 (307)
Report generated 2016-09-18 00:18:57
Download EtreCheck from https://etrecheck.com
Runtime 15:24
Performance: Poor
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Beachballing
Hardware Information: ⓘ
MacBook Pro (13-inch, Mid 2012)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Pro - model: MacBookPro9,2
1 2.9 GHz Intel Core i7 CPU: 2-core
8 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 498
Video Information: ⓘ
Intel HD Graphics 4000
Color LCD 1280 x 800
System Software: ⓘ
OS X Mavericks 10.9.5 (13F34) - Time since boot: less than an hour
Disk Information: ⓘ
APPLE SSD SM256E disk0 : (251 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 250.14 GB (238.52 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-ST DVDRW GS41N ()
USB Information: ⓘ
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper: ⓘ
Mac App Store and identified developers
System Launch Agents: ⓘ
[not loaded] 4 Apple tasks
[loaded] 147 Apple tasks
[running] 32 Apple tasks
System Launch Daemons: ⓘ
[not loaded] 50 Apple tasks
[loaded] 141 Apple tasks
[running] 57 Apple tasks
User Launch Agents: ⓘ
[loaded] com.google.keystone.agent.plist (2016-09-17) [Support]
Internet Plug-ins: ⓘ
Default Browser: 537 - SDK 10.9 (2016-09-17)
QuickTime Plugin: 7.7.3 (2016-09-17)
3rd Party Preference Panes: ⓘ
None
Time Machine: ⓘ
Time Machine not configured!
Top Processes by CPU: ⓘ
18% Google Chrome Helper(11)
6% Google Chrome
6% WindowServer
3% kernel_task
2% fontd
Top Processes by Memory: ⓘ
1.56 GB Google Chrome Helper(11)
482 MB kernel_task
147 MB Google Chrome
82 MB com.apple.IconServicesAgent
66 MB CVMCompiler(2)
Virtual Memory Information: ⓘ
4.58 GB Free RAM
3.41 GB Used RAM (1.23 GB Cached)
0 B Swap Used
Diagnostics Information: ⓘ
Sep 17, 2016, 11:55:54 PM Self test - passed