When using the 'Field Calculator...' in the Attribute Table on selected records in 10.3, the calculations (even simple ones like setting an integer field = 1) are excruciatingly slow. When using the 'Field Calculator...' on selected records in 10.2, the calculations are blisteringly fast. See the attached image. The split screen shows the identical calculation performed on a selected set of simple lines. In 10.2, the calculation took 0.23 seconds. In 10.3, the exact same calculation on the exact same number of selected lines took 20.13 seconds. Why?
I have been over all of the settings, environment variables, everything I can think of but there are no differences between the settings that I can see. Have I missed something? (Besides my marbles, I mean...)