I have been working with PLSQL Dev since 2005 or so and always showed off with my colleagues when it came to easy of use and performance compared to TOAD/SQLdev. Recently bought and installed v15 and it's a nightmare! I work with large datasets (EBS/HCM Cloud) and can really not afford to wait 5 to 10 seconds after every command. Please get this fixed Allround!

Update: I upgraded from v15.0.3.2059 (64bit) to 15.0.4.2064 (64bit) and the performance improved dramatically! It is back to normal again for me, very happy with that.