Iceweasel: Unofficial Firefox port on HaikuDepot

(using hrev58477 and latest Iceweasel nightly 128.5.0esr (64-bit))

On some content heavier pages, even like here, e.g.:

IceWeasel goes into a little rendering frenzy and CPU load gets very high.
View updates are stalled and when closing/quitting the app, it takes a while and can even lead to a crash with the memory manager.
Is this a known issue? Couldn’t find anything in the Github issues…

Debug information for team /boot/system/apps/Iceweasel/Iceweasel (858):
CPU(s): 8x Intel 11th Gen Core™ i7-1165G7
Memory: 31,85 GiB total, 4,87 GiB used
Haiku revision: hrev58477 Dec 29 2024 07:15:46 (x86_64)

Active Threads:
	thread 858: MainThread (main)
	thread 905: IPC I/O Child 
	thread 921: pool-spawner 
	thread 922: gmain 
	thread 929: pool-/boot/syst 
	thread 965: Socket Thread 
	thread 968: HTML5 Parser 
	thread 969: StyleThread#1 
	thread 970: StyleThread#2 
	thread 971: StyleThread#3 
	thread 972: StyleThread#4 
	thread 973: StyleThread#5 
	thread 976: JS Watchdog 
	thread 983: Backgro~Pool #1 
	thread 1003: Timer 
	thread 1005: RemVidChild 
	thread 1018: ImageIO 
	thread 1019: Worker Launcher 
	thread 1025: ImageBridgeChld 
	thread 1026: ProcessHangMon 
	thread 1115: RemoteLzyStream 
	thread 1146: pthread func 
	thread 1147: pthread func 
	thread 1148: pthread func 
	thread 1149: pthread func 
	thread 1150: pthread func 
	thread 1151: pthread func 
	thread 1152: pthread func 
	thread 1153: pthread func 
	thread 1491: DOM Worker 
	thread 42335: StreamT~ns #122 
	thread 42351: team 858 debug task 
	thread 919: Iceweasel 
		state: Exception (Invalid opcode exception)

		Frame		IP			Function Name
		-----------------------------------------------
		0x7ff62b6a66d0	0xc65290f02c	js::gc::IncrementalProgress js::gc::GCRuntime::markWeakReferences<js::gc::SweepGroupZonesIter>(js::SliceBudget&) + 0x4c 
			Disassembly:
				js::gc::IncrementalProgress js::gc::GCRuntime::markWeakReferences<js::gc::SweepGroupZonesIter>(js::SliceBudget&):
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