Does it have any slippage for trade copying?

We can not guarantee no slippage when copying trades from MT4 to Interactive Brokers(IB). But we are sure it can will be at the Fastest speed to send orders to IB account after order placing actions be deteted in MT4.

By the way, we suggest you select Market to Limit Order mode when starting the program. This mode will limit the copying price at the market best price. But it may lead to only partial filled. Details please refer to What’s the difference between Market Order and Market to Limit order mode?