tm_animate memory issue

[wrobell]

Please consider

library(sf)
library(tmap)

bbox <- st_bbox(c(xmin=-6.2,
                  ymin=53.4,
                  xmax=-6.1,
                  ymax=53.5),
                crs=st_crs(4326))
cp <- st_as_sfc(bbox) |> st_centroid()
cx = st_coordinates(cp)[,1]
cy = st_coordinates(cp)[,2]

tb = seq(as.POSIXct('2025-08-01 10:00:00', tz='UTC'),
         as.POSIXct('2025-08-01 12:00:00', tz='UTC'),
         by=1)
angle = seq(0, 2 * pi, length.out=length(tb))

data = st_sf(tb=tb,
             geometry=st_sfc(lapply(seq_len(length(tb)),
                                    function(i) st_point(c(cx + 0.025 * cos(angle[i]),
                                                           cy + 0.025 * sin(angle[i])))),
                             crs=4326),
             angle=angle)

p = (tm_basemap('CartoDB.Positron')
     + tm_shape(data, bbox=bbox, crs=4326)
     + tm_dots('location', fill='red', fill_alpha=0.75)
     + tm_options(facet.max=3600 * 3)
     + tm_animate_fast('tb', fps=30))

tmap_animation(p, file='plot-traffic-bug.mp4', width=1024, height=1024)

Running this script you can see memory usage steadily grow and the execution fails with error

*** recursive gc invocation

This also happens when I set TMP=~/tmp, so PNG files (frames) are stored on a hard drive instead of tmpfs.

tmap 4.3, sf 1.1