LR CC Classic - very slow processing

I've been using LR for several years. Over the past few months it has gotten really slow and visually unusable.. when I go to close (quit) LR it says it is still reading metadata. Usually takes 20-30 sec. to go from Library to Develop module to use their editing features.

Below is a partial copy of 'System Info' :

Lightroom version: CC 2015.12 [ 1125239 ]

License: Creative Cloud

Operating system: Mac OS 10

Version: 10.13 [4]

Application architecture: x64

Logical processor count: 2

Processor speed: 3.0 GHz

Built-in memory: 16,384.0 MB

Real memory available to Lightroom: 16,384.0 MB

Real memory used by Lightroom: 1,782.9 MB (10.8%)

Virtual memory used by Lightroom: 6,056.6 MB

Memory cache size: 936.1MB / 3,864.7MB (24.2%)

Maximum thread count used by Camera Raw: 2

Camera Raw SIMD optimization: SSE2

Camera Raw virtual memory: 774MB / 8191MB (9%)

Displays: 1) 1600x900

Graphics Processor Info:

ATI Radeon HD 4670 OpenGL Engine

Check OpenGL support: Passed

Vendor: ATI Technologies Inc.

Version: 3.3 ATI-10.4.14

Renderer: ATI Radeon HD 4670 OpenGL Engine

LanguageVersion: 3.30

I've been updating regularly. Nothing new as far as updates as of today.

What the heck is going on???