OH.
just in case its not a biab problem, there can be all sorts of reasons for problems.
please give details about your pc. as much as you can. otherwise its difficult to advise.
what is your sound device also ?

if your pc has never been optimised for recording studio work there are all sorts of guides on the net...eg from focusrite and audient web sites.
just one of many common problems is people running
a pc not properly configged for daw work. and/or trying to run oodles of plug ins on a pc with not enough resource "oomph".

please also under the top right hand side X in reaps...there is a detail line ; what does it say ?
it will indicate latency also.

finally reaps gives various stats on pc resource useage. by any chance are you useing any plug ins other than biab that use lots of pc resources ?
in addition when you clik on the reaps icon to load a new or old project , how long does it normally take ?
are you a new or seasoned reaps user ?
if a new user , note there are a huge number of superb
help videos at reaper.fm as well as on you tube.
about 80 in all i counted.

otoh maybe it IS a biab prob.

best
oldmuso

Last edited by justanoldmuso; 08/19/21 09:58 AM.

New Song "PRETTY GIRL" for my wife...Dec 2023
(my vocs....mixed for good earbuds.)
https://soundcloud.com/alfsongs/prettygirlrbfinalcalfsongsdec2023mp3
(and rock song THE STALLION and bluegrass song... BANKER MAN....90 songs useing bb/rb.)