To achieve "acceptable" performance with TIA Portal V13 SP1 Update 4, your hardware configuration is vital.
Even the final update has quirks. Engineers should be aware of these unresolved limitations: Tia Portal V13 Sp1 Update 4
: Provided stable support for S7-1200 CPUs (such as the 1214C) even when firmware versions differed slightly (e.g., using FW 4.1 configurations for FW 4.2 hardware). PLC Proxy Extensions To achieve "acceptable" performance with TIA Portal V13