Slowness of org-agenda-redo in org 9.7 vs 9.6.7

[dark . key8799]

I've been running 9.7 for a few weeks and I've noticed a slowdown in 
`org-agenda-redo'. I finally ran some benchmarks.

I can reproduce it with a minimal org config (bare init.el with only 
straight.el and a short org config) with my full `org-agenda-files' (~450 
files). In my regular conf, both are faster than the report below (I suppose 
because of gc collection parameters), about ~10s and ~1s respectively.

(use-package org
  ;:straight (:type built-in)
  :custom
  (org-agenda-inhibit-startup t)
  (org-agenda-dim-blocked-tasks nil)
  (org-agenda-window-setup 'current-window)
  (org-agenda-restore-windows-after-quit t)
  (org-agenda-show-future-repeats nil)
  (org-agenda-todo-ignore-scheduled 'all)
  (org-agenda-tags-todo-honor-ignore-options t)
  (org-agenda-tags-column 0)
  (org-tags-exclude-from-inheritance '("project"))
  (org-agenda-files
   '("~/Documents/Notes/" "~/Documents/Notes/org-roam/" 
"~/Documents/Notes/org-roam/daily/")))

Here's a truncated comparison of elp outputs
                                                              calls9_7  
elapsed9_7    average9_7  calls9_6_7  elapsed9_6_7  average9_6_7  diff_calls  
diff_elapsed
function                                                                        
                                                                                
  
org-agenda-redo                                                      1   
34.677843  3.467784e+01           1      6.764364  6.764364e+00           0     
27.913479
org-agenda-run-series                                                1   
34.672858  3.467286e+01           1      6.763294  6.763294e+00           0     
27.909564
org-element-cache-map                                             5904   
31.591816  5.350917e-03        5904      5.696144  9.647940e-04           0     
25.895672
org-tags-view                                                        6   
30.645603  5.107601e+00           6      5.897457  9.829095e-01           0     
24.748146
org-scan-tags                                                     2952   
30.300860  1.026452e-02        2952      5.590151  1.893683e-03           0     
24.710709
org-agenda-get-day-entries                                        1476    
3.594734  2.435457e-03        1476      0.606745  4.110738e-04           0      
2.987989
org-agenda-list                                                      1    
3.621574  3.621574e+00           1      0.665955  6.659550e-01           0      
2.955619
org-element-lineage-map                                          38658    
2.356579  6.095000e-05           0      0.000000  0.000000e+00       38658      
2.356579
org-element--property                                           706448    
1.981798  2.805000e-06           0      0.000000  0.000000e+00      706448      
1.981798
org-agenda-get-scheduled                                          1476    
1.947263  1.319284e-03        1476      0.241429  1.635697e-04           0      
1.705834
org-entry-get-with-inheritance                                   37938    
3.647018  9.613000e-05       37938      2.436293  6.421000e-05           0      
1.210725
org-agenda-get-deadlines                                          1476    
1.323156  8.964471e-04        1476      0.154018  1.043482e-04           0      
1.169138
org-element-begin                                               570514    
0.980263  1.718000e-06           0      0.000000  0.000000e+00      570514      
0.980263
org-element-property-inherited                                   40114    
0.881786  2.198000e-05           0      0.000000  0.000000e+00       40114      
0.881786
org-element-type                                               2805984    
0.888528  3.166000e-07      154150      0.054403  3.529000e-07     2651834      
0.834125
org-element--cache-key                                          164988    
0.789725  4.786000e-06           0      0.000000  0.000000e+00      164988      
0.789725
org-element-parent                                              255728    
0.771416  3.016000e-06           0      0.000000  0.000000e+00      255728      
0.771416
org-element-at-point                                            238169    
0.788185  3.309000e-06        8429      0.229212  2.719000e-05      229740      
0.558973
org--property-local-values                                      116449    
1.657522  1.423000e-05      115973      1.238066  1.067000e-05         476      
0.419456
org-element--parse-to                                             9564    
0.480723  5.026000e-05        9611      0.079269  8.247000e-06         -47      
0.401454
org--get-local-tags                                              38172    
0.242883  6.362000e-06         234      0.001800  7.692000e-06       37938      
0.241083
org-element--cache-find                                           9540    
0.272448  2.855000e-05        9587      0.053306  5.560000e-06         -47      
0.219142
org-agenda-prepare                                                   9    
0.298073  3.311922e-02           9      0.114234  1.269267e-02           0      
0.183839
org-agenda-prepare-buffers                                           1    
0.288492  2.884920e-01           1      0.108683  1.086830e-01           0      
0.179809
org-set-regexps-and-options                                        492    
0.181551  3.690060e-04         492      0.019952  4.055000e-05           0      
0.161599
org-element-contents-end                                         87720    
0.130603  1.488000e-06           0      0.000000  0.000000e+00       87720      
0.130603
org-agenda-entry-get-agenda-timestamp                            37883    
0.197997  5.226000e-06       37883      0.069473  1.833000e-06           0      
0.128524
org-collect-keywords                                               492    
0.126222  2.565487e-04         492      0.017828  3.623000e-05           0      
0.108394
org--collect-keywords-1                                            492    
0.124751  2.535589e-04         492      0.016960  3.447000e-05           0      
0.107791
org-agenda-skip                                                    971    
0.129958  1.338393e-04         971      0.027204  2.801000e-05           0      
0.102754