UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3451.0 Safari/537.36

Steps to reproduce the problem:
1. Create a table with a <thead> containing many rows (the more the better).
2. Add <table> style "border-collapse: collapse;" and <tr> style "border-top: 1px solid #000".
3. Print the page, observe great performance.
4. Change <tr> style to "border-top: 1px dotted #000".
5. Print the page, observe performance is significantly worse.

To narrow down the issue further:
6. Add <thead> style "display: table-row-group;"
7. Print page, observe performance is similar to solid border.

What is the expected behavior?
Performance printing solid borders and dotted borders should be similar, even when table headers are repeating.

What went wrong?
There is a significant performance penalty when using dotted table row borders when table headers are repeated on multiple pages.

Did this work before? Yes 67.0.3396.87

Chrome version: 69.0.3451.0  Channel: dev
OS Version: OS X 10.13.3
Flash Version: 

We're also seeing this issue on Linux 68.0.3440.17.

In our testing with approx. 2000 rows the performance difference is very significant. The "solid border" and "no repeating headers" documents are printed in < 1s, while the "dotted border" document takes over ten seconds.
 

Deleted: slow_print_dotted_border.html 58.3 KB

slow_print_dotted_border.html 58.3 KB View Download

Deleted: slow_print_solid_border.html 58.4 KB

slow_print_solid_border.html 58.4 KB View Download

Deleted: slow_print_no_reapeat_header.html 58.4 KB

slow_print_no_reapeat_header.html 58.4 KB View Download