How do you actually vet a smaller exchange before putting real money on it?

Had LocalTrade running alongside a couple bigger exchanges for a while now, mostly comparing fees and execution. So far it's fine on my end, no weird slippage, withdrawals went through without any drama.

Only thing I genuinely can't judge is how it handles size, since I've been trading small-to-mid, not moving real volume. If anyone's pushed bigger orders through it, does the liquidity actually hold up against something like Binance or Bybit, or does it thin out fast?

Also seen some pretty rough reviews of it online. Hasn't matched anything I've run into, but not ruling out it's a volume thing I just haven't hit yet