Lightroom classic 7.2 on Mac High Sierra not performing at all: Do not use GP !

This is system info:  (note that I reverted back to 7.1, as 7.2 was not working even with GP off)

Lightroom Classic version: 7.1 [ 1148620 ]

License: Creative Cloud

Language setting: en-NL

Operating system: Mac OS 10

Version: 10.13.3 [17D47]

Application architecture: x64

Logical processor count: 8

Processor speed: 3,2 GHz

Built-in memory: 16.384,0 MB

Real memory available to Lightroom: 16.384,0 MB

Real memory used by Lightroom: 1.269,2 MB (7,7%)

Virtual memory used by Lightroom: 4.335,8 MB

Memory cache size: 84,2MB

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2

Camera Raw virtual memory: 664MB / 8191MB (8%)

Camera Raw real memory: 665MB / 16384MB (4%)

Displays: 1) 2560x1440

Graphics Processor Info:

OpenGL: ATI Radeon HD 5770 OpenGL Engine

Check OpenGL support: Passed

Vendor: ATI Technologies Inc.

Version: 4.1 ATI-1.60.26

Renderer: ATI Radeon HD 5770 OpenGL Engine

LanguageVersion: 4.10

Total Video Memory: 1024 MB

Application folder: /Applications/Adobe Lightroom Classic CC

Library Path: /Volumes/Data2 /LightRoom_Cats/Lightroom Catalog-2.lrcat

Settings Folder: /Users/hansvanderkruijf/Library/Application Support/Adobe/Lightroom

Installed Plugins:

1) AdobeStock

2) Aperture/iPhoto Importer Plug-in

3) Canon Tether Plugin

4) Epson Print Layout

5) Facebook

6) Flickr

7) Focus CK

8) FX Photo Studio CK

9) HDR Efex Pro 2

10) Intensify CK

11) LR/Instagram

12) Luminar

13) Macphun Creative Kit

14) Nikon Tether Plugin

15) Noiseless CK

16) Snapheal CK

17) Tonality CK

Config.lua flags: None

AudioDeviceIOBlockSize: 512

AudioDeviceName: Built-in Line Output

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 44100

Build: 10.0x7

CoreImage: true

GL_ACCUM_ALPHA_BITS: 0

GL_ACCUM_BLUE_BITS: 0

GL_ACCUM_GREEN_BITS: 0

GL_ACCUM_RED_BITS: 0

GL_ALPHA_BITS: 8

GL_BLUE_BITS: 8

GL_DEPTH_BITS: 24

GL_GREEN_BITS: 8

GL_MAX_3D_TEXTURE_SIZE: 16384

GL_MAX_TEXTURE_SIZE: 16384

GL_MAX_TEXTURE_UNITS: 8

GL_MAX_VIEWPORT_DIMS: 16384,16384

GL_RED_BITS: 8

GL_RENDERER: ATI Radeon HD 5770 OpenGL Engine

GL_SHADING_LANGUAGE_VERSION: 1.20

GL_STENCIL_BITS: 8

GL_VENDOR: ATI Technologies Inc.

GL_VERSION: 2.1 ATI-1.60.26

OGLEnabled: true

GL_EXTENSIONS: GL_ARB_color_buffer_float GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_instanced_arrays GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_provoking_vertex GL_ARB_seamless_cube_map GL_ARB_shader_objects GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_sync GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_transpose_matrix GL_ARB_vertex_array_bgra GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_draw_buffers2 GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_rectangle GL_EXT_texture_shared_exponent GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_APPLE_aux_depth_stencil GL_APPLE_client_storage GL_APPLE_element_array GL_APPLE_fence GL_APPLE_float_pixels GL_APPLE_flush_buffer_range GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_packed_pixels GL_APPLE_pixel_buffer GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_specular_vector GL_APPLE_texture_range GL_APPLE_transform_hint GL_APPLE_vertex_array_object GL_APPLE_vertex_array_range GL_APPLE_vertex_point_size GL_APPLE_vertex_program_evaluators GL_APPLE_ycbcr_422 GL_ATI_blend_equation_separate GL_ATI_blend_weighted_minmax GL_ATI_separate_stencil GL_ATI_texture_compression_3dc GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_IBM_rasterpos_clip GL_NV_blend_square GL_NV_conditional_render GL_NV_depth_clamp GL_NV_fog_distance GL_NV_light_max_exponent GL_NV_texgen_reflection GL_NV_texture_barrier GL_SGI_color_matrix GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod