because, I tested it on my laptop.
Table schema:
create table tbl(f1 int, f2 char(100), f3 float4, f4 char(100), f5 float8, f6 char(100), f7 bigint);
Tbl with 3 indexes
1000 record deletion
master - 22ms
patch - 25ms with 0 parallel workers
patch - 43ms with 1 parallel worker
patch - 72ms with 2 parallel workers
10000 record deletion
master - 52ms
patch - 56ms with 0 parallel workers
patch - 79ms with 1 parallel worker
patch - 86ms with 2 parallel workers
100000 record deletion
master - 410ms
patch - 379ms with 0 parallel workers
patch - 330ms with 1 parallel worker
patch - 289ms with 2 parallel workers
Tbl with 5 indexes
1000 record deletion
master - 28ms
patch - 34ms with 0 parallel workers
patch - 86ms with 2 parallel workers
patch - 106ms with 4 parallel workers
10000 record deletion
master - 58ms
patch - 63ms with 0 parallel workers
patch - 101ms with 2 parallel workers
patch - 118ms with 4 parallel workers
100000 record deletion
master - 632ms
patch - 490ms with 0 parallel workers
patch - 455ms with 2 parallel workers
patch - 403ms with 4 parallel workers
Tbl with 7 indexes
1000 record deletion
master - 35ms
patch - 44ms with 0 parallel workers
patch - 93ms with 2 parallel workers
patch - 110ms with 4 parallel workers
patch - 123ms with 6 parallel workers
10000 record deletion
master - 76ms
patch - 78ms with 0 parallel workers
patch - 135ms with 2 parallel workers
patch - 143ms with 4 parallel workers
patch - 139ms with 6 parallel workers
100000 record deletion
master - 641ms
patch - 656ms with 0 parallel workers
patch - 613ms with 2 parallel workers
patch - 735ms with 4 parallel workers
patch - 679ms with 6 parallel workers