Crafted smart contract can take ~23 seconds to execute due to immense error string construction

Calling the native contract (`rskj-core/src/main/java/co/rsk/pcc/NativeContract.java`) with an invalid, large input (1081344 bytes -- I experimentally determined that this is about the slowest I can go) in an infinite loop (until gas runs out) takes about 70 seconds on my machine (I assume ~23 …

String errorMessage = String.format("Invalid data given: %s.", ByteUtil.toHexString(data));