Prop Firm Spreads and Execution Lag on Exotic Pairs

Curious if others are seeing significant spread widening and noticeable execution lag on more exotic FX pairs with the prop firms they're using. I've been running a few setups on $AUDNZD and $CADJPY recently, and while $EURUSD and $GBPUSD execution is generally fine, it feels like I'm getting hammered on the slippage and wider spreads when placing orders on these less liquid pairs, especially during volatile sessions. It's not just the quoted spread; the effective spread seems to be a moving target, making entries/exits tough to manage.

Is this just a fact of life with prop firm infrastructure, or are some firms demonstrably better at providing tighter execution on these crosses? I'm trying to figure out if it's my strategy being too sensitive or if there's a genuine disparity in liquidity provision/brokerage relationships among prop firms that impacts these specific assets. Any insights on optimizing for this or firms that perform better in this regard would be helpful.