Wa! Iron 28.0.1550.0 is very agile!
Thank you, SRWare! You're fantastic.
I tested using speed-battle.com. Results were Calculate 115.38 (v 27 was the same, 115.38), Store 436.91 (v 27 was 268.59), Render 8.26 (v 27 was 8.83), giving an Overall Score of 560.68 (v 27 was 392.8).
I tested using peacekeeper.futuremark.com. Results were 4268 (v 27 was 4047).
Your figures will vary, because your CPU, RAM etc are likely faster than those of my aged x64 laptop.
I must admit not being too fussed by the change to white in the drop-down menu, the change that ironuser has mentioned.