Lightroom Classic slows imports to a crawl.

In as test, it took 37 sec to import 21 Canon dmg files of approx 20 Mb each. This is a small sample, when I import a shoot with 200-400 photos, it takes a very long time. It didn't used to be so bad before LR Classic, so I really never measured it. Here are my computer specs:

Mac Pro 2009 with AMD Radeon HD 7950.

Here are the details from Lightroom:

x

Lightroom Classic version: 7.0.1 [ 1142117 ]

License: Creative Cloud

Operating system: Mac OS 10

Version: 10.11 [6]

Application architecture: x64

Logical processor count: 8

Processor speed: 2.6 GHz

Built-in memory: 16,384.0 MB

Real memory available to Lightroom: 16,384.0 MB

Real memory used by Lightroom: 1,270.3 MB (7.7%)

Virtual memory used by Lightroom: 4,499.1 MB

Memory cache size: 25.2MB

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2

Camera Raw virtual memory: 190MB / 8191MB (2%)

Camera Raw real memory: 190MB / 16384MB (1%)

Displays: 1) 3440x1440

Graphics Processor Info:

OpenGL: AMD Radeon HD 7950 OpenGL Engine

Check OpenGL support: Passed

Vendor: ATI Technologies Inc.

Version: 4.1 ATI-1.42.15

Renderer: AMD Radeon HD 7950 OpenGL Engine

LanguageVersion: 4.10

Total Video Memory: 3072 MB

Besides the obvious, 'buy a new 8-core computer', what changed with Classic and what can be done to help it until the new Mac Pros come out in a couple years?

Give us the details.